// author: Fabian Hassler
// year: 2019

// This module implements a list of colormaps
// the code has been converted from the python library
//           matplotlib 3.0.2 license under BSD
// Feel free to use or to modify the code

// example: the generate a palette wistia
//    pen[] Palette = wistia.palette()
//
// There are two types of palettes. For a complete list see below:
//
// 1) The segmented palettes can be used as
//      <name>.palette(int NColors=256, real gamma=1.)
//         NColors are the number of colors in the palette
//         gamma is the gamma-factor
//
// 2) The listed palettes can only be used as
//      <name>.palette()
//
// Both functions return pen[] that can be used as a palette in the
// module palette.

// list of palettes
//    see also https://matplotlib.org/tutorials/colors/colormaps.html

// segmented palettes:
//     CMRmap
//     autumn
//     binary
//     bone
//     cool
//     coolwarm
//     copper
//     gist_earth
//     gist_ncar
//     gist_stern
//     gray
//     hot
//     hsv
//     jet
//     nipy_spectral
//     pink
//     spring
//     summer
//     winter
//     wistia

// listed palettes:
//     Accent
//     Blues
//     BrBG
//     BuGn
//     BuPu
//     Dark2
//     GnBu
//     Greens
//     Greys
//     OrRd
//     Oranges
//     PRGn
//     Paired
//     Pastel1
//     Pastel2
//     PiYG
//     PuBuGn
//     PuBu
//     PuOr
//     PuRd
//     Purples
//     RdBu
//     RdGy
//     RdPu
//     RdYlBu
//     RdYlGn
//     Reds
//     Set1
//     Set2
//     Set3
//     Spectral
//     YlGnBu
//     YlGn
//     YlOrBr
//     YlOrRd
//     brg
//     bwr
//     seismic
//     tab10
//     tab20
//     tab20b
//     tab20c
//     cividis
//     inferno
//     magma
//     plasma
//     twilight
//     twilight_shifted
//     viridis


// Example of usage:

// import graph;
// import palette;
// import colormap;
// int NColors=5;
// pen[] Palette=spring.palette(NColors);
// palette(bounds(0,1),(0.,0),(500,50),Bottom,Palette);

//
// SOURCE CODE
//
private real[] makeMappingArray(int N, triple[] data, real gamma=1.) {
  real[] x;
  real[] y0;
  real[] y1;

  for (int i=0; i<data.length; ++i) {
    x.push(data[i].x);
    y0.push(data[i].y);
    y1.push(data[i].z);
  };

  x = x*(N-1);
  real[] lut = new real[N];
  real[] xind = (N - 1) * uniform(0, 1, N-1) ** gamma;
  int[] ind = map(new int(real xi) {return search(x, xi);}, xind);
  ind = ind[1:N-1]; // note that the index is shifted from python

  real[] dist = (xind[1:N-1] - x[ind])/(x[ind+1] - x[ind]);

  lut[1:N-1] = dist * (y0[ind+1] - y1[ind]) + y1[ind];
  lut[0] = y1[0];
  lut[N-1] = y0[y0.length-1];
  return lut;
}

// struct for segmented data
struct seg_data {
  private triple[] r; // red
  private triple[] g; // green
  private triple[] b; // blue

  void operator init(triple[] r, triple[] g, triple[] b) {
    this.r=r;
    this.g=g;
    this.b=b;
  }

  pen[] palette(int NColors=256, real gamma=1.) {
    real[] red   = makeMappingArray(NColors, this.r, gamma);
    real[] green = makeMappingArray(NColors, this.g, gamma);
    real[] blue  = makeMappingArray(NColors, this.b, gamma);

    pen[] pal =
      sequence(new pen(int i) {return rgb(red[i], green[i], blue[i]);},
               NColors);

    return pal;
  }
}

// struct for list data
struct list_data {
  private pen[] data;
  pen[] palette(){return data;}
  void operator init(pen[] d) {
    this.data=d;
  }
}

//
// DATA
//
list_data Accent = list_data(new pen[] {
    rgb (0.4980392156862745, 0.788235294117647, 0.4980392156862745) ,
      rgb (0.7450980392156863, 0.6823529411764706, 0.8313725490196079) ,
      rgb (0.9921568627450981, 0.7529411764705882, 0.5254901960784314) ,
      rgb (1.0, 1.0, 0.6) ,
      rgb (0.2196078431372549, 0.4235294117647059, 0.6901960784313725) ,
      rgb (0.9411764705882353, 0.00784313725490196, 0.4980392156862745) ,
      rgb (0.7490196078431373, 0.3568627450980392, 0.09019607843137253) ,
      rgb (0.4, 0.4, 0.4)
      });


list_data Blues = list_data(new pen[] {
    rgb (0.9686274509803922, 0.984313725490196, 1.0) ,
      rgb (0.8705882352941177, 0.9215686274509803, 0.9686274509803922) ,
      rgb (0.7764705882352941, 0.8588235294117647, 0.9372549019607843) ,
      rgb (0.6196078431372549, 0.792156862745098, 0.8823529411764706) ,
      rgb (0.4196078431372549, 0.6823529411764706, 0.8392156862745098) ,
      rgb (0.25882352941176473, 0.5725490196078431, 0.7764705882352941) ,
      rgb (0.12941176470588237, 0.44313725490196076, 0.7098039215686275) ,
      rgb (0.03137254901960784, 0.3176470588235294, 0.611764705882353) ,
      rgb (0.03137254901960784, 0.18823529411764706, 0.4196078431372549)
      });


list_data BrBG = list_data(new pen[] {
    rgb (0.32941176470588235, 0.18823529411764706, 0.0196078431372549) ,
      rgb (0.5490196078431373, 0.3176470588235294, 0.0392156862745098) ,
      rgb (0.7490196078431373, 0.5058823529411764, 0.17647058823529413) ,
      rgb (0.8745098039215686, 0.7607843137254902, 0.49019607843137253) ,
      rgb (0.9647058823529412, 0.9098039215686274, 0.7647058823529411) ,
      rgb (0.9607843137254902, 0.9607843137254902, 0.9607843137254902) ,
      rgb (0.7803921568627451, 0.9176470588235294, 0.8980392156862745) ,
      rgb (0.5019607843137255, 0.803921568627451, 0.7568627450980392) ,
      rgb (0.20784313725490197, 0.592156862745098, 0.5607843137254902) ,
      rgb (0.00392156862745098, 0.4, 0.3686274509803922) ,
      rgb (0.0, 0.23529411764705882, 0.18823529411764706)
      });


list_data BuGn = list_data(new pen[] {
    rgb (0.9686274509803922, 0.9882352941176471, 0.9921568627450981) ,
      rgb (0.8980392156862745, 0.9607843137254902, 0.9764705882352941) ,
      rgb (0.8, 0.9254901960784314, 0.9019607843137255) ,
      rgb (0.6, 0.8470588235294118, 0.788235294117647) ,
      rgb (0.4, 0.7607843137254902, 0.6431372549019608) ,
      rgb (0.2549019607843137, 0.6823529411764706, 0.4627450980392157) ,
      rgb (0.13725490196078433, 0.5450980392156862, 0.27058823529411763) ,
      rgb (0.0, 0.42745098039215684, 0.17254901960784313) ,
      rgb (0.0, 0.26666666666666666, 0.10588235294117647)
      });


list_data BuPu = list_data(new pen[] {
    rgb (0.9686274509803922, 0.9882352941176471, 0.9921568627450981) ,
      rgb (0.8784313725490196, 0.9254901960784314, 0.9568627450980393) ,
      rgb (0.7490196078431373, 0.8274509803921568, 0.9019607843137255) ,
      rgb (0.6196078431372549, 0.7372549019607844, 0.8549019607843137) ,
      rgb (0.5490196078431373, 0.5882352941176471, 0.7764705882352941) ,
      rgb (0.5490196078431373, 0.4196078431372549, 0.6941176470588235) ,
      rgb (0.5333333333333333, 0.2549019607843137, 0.615686274509804) ,
      rgb (0.5058823529411764, 0.05882352941176471, 0.48627450980392156) ,
      rgb (0.30196078431372547, 0.0, 0.29411764705882354)
      });


seg_data CMRmap = seg_data(
                           new triple[] {  // red
                             (0.0, 0.0, 0.0) ,
                               (0.125, 0.15, 0.15) ,
                               (0.25, 0.3, 0.3) ,
                               (0.375, 0.6, 0.6) ,
                               (0.5, 1.0, 1.0) ,
                               (0.625, 0.9, 0.9) ,
                               (0.75, 0.9, 0.9) ,
                               (0.875, 0.9, 0.9) ,
                               (1.0, 1.0, 1.0)
                               },
                           new triple[] {  // green
                             (0.0, 0.0, 0.0) ,
                               (0.125, 0.15, 0.15) ,
                               (0.25, 0.15, 0.15) ,
                               (0.375, 0.2, 0.2) ,
                               (0.5, 0.25, 0.25) ,
                               (0.625, 0.5, 0.5) ,
                               (0.75, 0.75, 0.75) ,
                               (0.875, 0.9, 0.9) ,
                               (1.0, 1.0, 1.0)
                               },
                           new triple[] {  // blue
                             (0.0, 0.0, 0.0) ,
                               (0.125, 0.5, 0.5) ,
                               (0.25, 0.75, 0.75) ,
                               (0.375, 0.5, 0.5) ,
                               (0.5, 0.15, 0.15) ,
                               (0.625, 0.0, 0.0) ,
                               (0.75, 0.1, 0.1) ,
                               (0.875, 0.5, 0.5) ,
                               (1.0, 1.0, 1.0)
                               }
                           );


list_data Dark2 = list_data(new pen[] {
    rgb (0.10588235294117647, 0.6196078431372549, 0.4666666666666667) ,
      rgb (0.8509803921568627, 0.37254901960784315, 0.00784313725490196) ,
      rgb (0.4588235294117647, 0.4392156862745098, 0.7019607843137254) ,
      rgb (0.9058823529411765, 0.1607843137254902, 0.5411764705882353) ,
      rgb (0.4, 0.6509803921568628, 0.11764705882352941) ,
      rgb (0.9019607843137255, 0.6705882352941176, 0.00784313725490196) ,
      rgb (0.6509803921568628, 0.4627450980392157, 0.11372549019607843) ,
      rgb (0.4, 0.4, 0.4)
      });


list_data GnBu = list_data(new pen[] {
    rgb (0.9686274509803922, 0.9882352941176471, 0.9411764705882353) ,
      rgb (0.8784313725490196, 0.9529411764705882, 0.8588235294117647) ,
      rgb (0.8, 0.9215686274509803, 0.7725490196078432) ,
      rgb (0.6588235294117647, 0.8666666666666667, 0.7098039215686275) ,
      rgb (0.4823529411764706, 0.8, 0.7686274509803922) ,
      rgb (0.3058823529411765, 0.7019607843137254, 0.8274509803921568) ,
      rgb (0.16862745098039217, 0.5490196078431373, 0.7450980392156863) ,
      rgb (0.03137254901960784, 0.40784313725490196, 0.6745098039215687) ,
      rgb (0.03137254901960784, 0.25098039215686274, 0.5058823529411764)
      });


list_data Greens = list_data(new pen[] {
    rgb (0.9686274509803922, 0.9882352941176471, 0.9607843137254902) ,
      rgb (0.8980392156862745, 0.9607843137254902, 0.8784313725490196) ,
      rgb (0.7803921568627451, 0.9137254901960784, 0.7529411764705882) ,
      rgb (0.6313725490196078, 0.8509803921568627, 0.6078431372549019) ,
      rgb (0.4549019607843137, 0.7686274509803922, 0.4627450980392157) ,
      rgb (0.2549019607843137, 0.6705882352941176, 0.36470588235294116) ,
      rgb (0.13725490196078433, 0.5450980392156862, 0.27058823529411763) ,
      rgb (0.0, 0.42745098039215684, 0.17254901960784313) ,
      rgb (0.0, 0.26666666666666666, 0.10588235294117647)
      });


list_data Greys = list_data(new pen[] {
    rgb (1.0, 1.0, 1.0) ,
      rgb (0.9411764705882353, 0.9411764705882353, 0.9411764705882353) ,
      rgb (0.8509803921568627, 0.8509803921568627, 0.8509803921568627) ,
      rgb (0.7411764705882353, 0.7411764705882353, 0.7411764705882353) ,
      rgb (0.5882352941176471, 0.5882352941176471, 0.5882352941176471) ,
      rgb (0.45098039215686275, 0.45098039215686275, 0.45098039215686275) ,
      rgb (0.3215686274509804, 0.3215686274509804, 0.3215686274509804) ,
      rgb (0.1450980392156863, 0.1450980392156863, 0.1450980392156863) ,
      rgb (0.0, 0.0, 0.0)
      });


list_data OrRd = list_data(new pen[] {
    rgb (1.0, 0.9686274509803922, 0.9254901960784314) ,
      rgb (0.996078431372549, 0.9098039215686274, 0.7843137254901961) ,
      rgb (0.9921568627450981, 0.8313725490196079, 0.6196078431372549) ,
      rgb (0.9921568627450981, 0.7333333333333333, 0.5176470588235295) ,
      rgb (0.9882352941176471, 0.5529411764705883, 0.34901960784313724) ,
      rgb (0.9372549019607843, 0.396078431372549, 0.2823529411764706) ,
      rgb (0.8431372549019608, 0.18823529411764706, 0.12156862745098039) ,
      rgb (0.7019607843137254, 0.0, 0.0) ,
      rgb (0.4980392156862745, 0.0, 0.0)
      });


list_data Oranges = list_data(new pen[] {
    rgb (1.0, 0.9607843137254902, 0.9215686274509803) ,
      rgb (0.996078431372549, 0.9019607843137255, 0.807843137254902) ,
      rgb (0.9921568627450981, 0.8156862745098039, 0.6352941176470588) ,
      rgb (0.9921568627450981, 0.6823529411764706, 0.4196078431372549) ,
      rgb (0.9921568627450981, 0.5529411764705883, 0.23529411764705882) ,
      rgb (0.9450980392156862, 0.4117647058823529, 0.07450980392156863) ,
      rgb (0.8509803921568627, 0.2823529411764706, 0.00392156862745098) ,
      rgb (0.6509803921568628, 0.21176470588235294, 0.01176470588235294) ,
      rgb (0.4980392156862745, 0.15294117647058825, 0.01568627450980392)
      });


list_data PRGn = list_data(new pen[] {
    rgb (0.25098039215686274, 0.0, 0.29411764705882354) ,
      rgb (0.4627450980392157, 0.16470588235294117, 0.5137254901960784) ,
      rgb (0.6, 0.4392156862745098, 0.6705882352941176) ,
      rgb (0.7607843137254902, 0.6470588235294118, 0.8117647058823529) ,
      rgb (0.9058823529411765, 0.8313725490196079, 0.9098039215686274) ,
      rgb (0.9686274509803922, 0.9686274509803922, 0.9686274509803922) ,
      rgb (0.8509803921568627, 0.9411764705882353, 0.8274509803921568) ,
      rgb (0.6509803921568628, 0.8588235294117647, 0.6274509803921569) ,
      rgb (0.35294117647058826, 0.6823529411764706, 0.3803921568627451) ,
      rgb (0.10588235294117647, 0.47058823529411764, 0.21568627450980393) ,
      rgb (0.0, 0.26666666666666666, 0.10588235294117647)
      });


list_data Paired = list_data(new pen[] {
    rgb (0.6509803921568628, 0.807843137254902, 0.8901960784313725) ,
      rgb (0.12156862745098039, 0.47058823529411764, 0.7058823529411765) ,
      rgb (0.6980392156862745, 0.8745098039215686, 0.5411764705882353) ,
      rgb (0.2, 0.6274509803921569, 0.17254901960784313) ,
      rgb (0.984313725490196, 0.6039215686274509, 0.6) ,
      rgb (0.8901960784313725, 0.10196078431372549, 0.10980392156862745) ,
      rgb (0.9921568627450981, 0.7490196078431373, 0.43529411764705883) ,
      rgb (1.0, 0.4980392156862745, 0.0) ,
      rgb (0.792156862745098, 0.6980392156862745, 0.8392156862745098) ,
      rgb (0.41568627450980394, 0.23921568627450981, 0.6039215686274509) ,
      rgb (1.0, 1.0, 0.6) ,
      rgb (0.6941176470588235, 0.34901960784313724, 0.1568627450980392)
      });


list_data Pastel1 = list_data(new pen[] {
    rgb (0.984313725490196, 0.7058823529411765, 0.6823529411764706) ,
      rgb (0.7019607843137254, 0.803921568627451, 0.8901960784313725) ,
      rgb (0.8, 0.9215686274509803, 0.7725490196078432) ,
      rgb (0.8705882352941177, 0.796078431372549, 0.8941176470588236) ,
      rgb (0.996078431372549, 0.8509803921568627, 0.6509803921568628) ,
      rgb (1.0, 1.0, 0.8) ,
      rgb (0.8980392156862745, 0.8470588235294118, 0.7411764705882353) ,
      rgb (0.9921568627450981, 0.8549019607843137, 0.9254901960784314) ,
      rgb (0.9490196078431372, 0.9490196078431372, 0.9490196078431372)
      });


list_data Pastel2 = list_data(new pen[] {
    rgb (0.7019607843137254, 0.8862745098039215, 0.803921568627451) ,
      rgb (0.9921568627450981, 0.803921568627451, 0.6745098039215687) ,
      rgb (0.796078431372549, 0.8352941176470589, 0.9098039215686274) ,
      rgb (0.9568627450980393, 0.792156862745098, 0.8941176470588236) ,
      rgb (0.9019607843137255, 0.9607843137254902, 0.788235294117647) ,
      rgb (1.0, 0.9490196078431372, 0.6823529411764706) ,
      rgb (0.9450980392156862, 0.8862745098039215, 0.8) ,
      rgb (0.8, 0.8, 0.8)
      });


list_data PiYG = list_data(new pen[] {
    rgb (0.5568627450980392, 0.00392156862745098, 0.3215686274509804) ,
      rgb (0.7725490196078432, 0.10588235294117647, 0.49019607843137253) ,
      rgb (0.8705882352941177, 0.4666666666666667, 0.6823529411764706) ,
      rgb (0.9450980392156862, 0.7137254901960784, 0.8549019607843137) ,
      rgb (0.9921568627450981, 0.8784313725490196, 0.9372549019607843) ,
      rgb (0.9686274509803922, 0.9686274509803922, 0.9686274509803922) ,
      rgb (0.9019607843137255, 0.9607843137254902, 0.8156862745098039) ,
      rgb (0.7215686274509804, 0.8823529411764706, 0.5254901960784314) ,
      rgb (0.4980392156862745, 0.7372549019607844, 0.2549019607843137) ,
      rgb (0.30196078431372547, 0.5725490196078431, 0.12941176470588237) ,
      rgb (0.15294117647058825, 0.39215686274509803, 0.09803921568627451)
      });


list_data PuBuGn = list_data(new pen[] {
    rgb (1.0, 0.9686274509803922, 0.984313725490196) ,
      rgb (0.9254901960784314, 0.8862745098039215, 0.9411764705882353) ,
      rgb (0.8156862745098039, 0.8196078431372549, 0.9019607843137255) ,
      rgb (0.6509803921568628, 0.7411764705882353, 0.8588235294117647) ,
      rgb (0.403921568627451, 0.6627450980392157, 0.8117647058823529) ,
      rgb (0.21176470588235294, 0.5647058823529412, 0.7529411764705882) ,
      rgb (0.00784313725490196, 0.5058823529411764, 0.5411764705882353) ,
      rgb (0.00392156862745098, 0.4235294117647059, 0.34901960784313724) ,
      rgb (0.00392156862745098, 0.27450980392156865, 0.21176470588235294)
      });


list_data PuBu = list_data(new pen[] {
    rgb (1.0, 0.9686274509803922, 0.984313725490196) ,
      rgb (0.9254901960784314, 0.9058823529411765, 0.9490196078431372) ,
      rgb (0.8156862745098039, 0.8196078431372549, 0.9019607843137255) ,
      rgb (0.6509803921568628, 0.7411764705882353, 0.8588235294117647) ,
      rgb (0.4549019607843137, 0.6627450980392157, 0.8117647058823529) ,
      rgb (0.21176470588235294, 0.5647058823529412, 0.7529411764705882) ,
      rgb (0.0196078431372549, 0.4392156862745098, 0.6901960784313725) ,
      rgb (0.01568627450980392, 0.35294117647058826, 0.5529411764705883) ,
      rgb (0.00784313725490196, 0.2196078431372549, 0.34509803921568627)
      });


list_data PuOr = list_data(new pen[] {
    rgb (0.4980392156862745, 0.23137254901960785, 0.03137254901960784) ,
      rgb (0.7019607843137254, 0.34509803921568627, 0.02352941176470588) ,
      rgb (0.8784313725490196, 0.5098039215686274, 0.0784313725490196) ,
      rgb (0.9921568627450981, 0.7215686274509804, 0.38823529411764707) ,
      rgb (0.996078431372549, 0.8784313725490196, 0.7137254901960784) ,
      rgb (0.9686274509803922, 0.9686274509803922, 0.9686274509803922) ,
      rgb (0.8470588235294118, 0.8549019607843137, 0.9215686274509803) ,
      rgb (0.6980392156862745, 0.6705882352941176, 0.8235294117647058) ,
      rgb (0.5019607843137255, 0.45098039215686275, 0.6745098039215687) ,
      rgb (0.32941176470588235, 0.15294117647058825, 0.5333333333333333) ,
      rgb (0.17647058823529413, 0.0, 0.29411764705882354)
      });


list_data PuRd = list_data(new pen[] {
    rgb (0.9686274509803922, 0.9568627450980393, 0.9764705882352941) ,
      rgb (0.9058823529411765, 0.8823529411764706, 0.9372549019607843) ,
      rgb (0.8313725490196079, 0.7254901960784313, 0.8549019607843137) ,
      rgb (0.788235294117647, 0.5803921568627451, 0.7803921568627451) ,
      rgb (0.8745098039215686, 0.396078431372549, 0.6901960784313725) ,
      rgb (0.9058823529411765, 0.1607843137254902, 0.5411764705882353) ,
      rgb (0.807843137254902, 0.07058823529411765, 0.33725490196078434) ,
      rgb (0.596078431372549, 0.0, 0.2627450980392157) ,
      rgb (0.403921568627451, 0.0, 0.12156862745098039)
      });


list_data Purples = list_data(new pen[] {
    rgb (0.9882352941176471, 0.984313725490196, 0.9921568627450981) ,
      rgb (0.9372549019607843, 0.9294117647058824, 0.9607843137254902) ,
      rgb (0.8549019607843137, 0.8549019607843137, 0.9215686274509803) ,
      rgb (0.7372549019607844, 0.7411764705882353, 0.8627450980392157) ,
      rgb (0.6196078431372549, 0.6039215686274509, 0.7843137254901961) ,
      rgb (0.5019607843137255, 0.49019607843137253, 0.7294117647058823) ,
      rgb (0.41568627450980394, 0.3176470588235294, 0.6392156862745098) ,
      rgb (0.32941176470588235, 0.15294117647058825, 0.5607843137254902) ,
      rgb (0.24705882352941178, 0.0, 0.49019607843137253)
      });


list_data RdBu = list_data(new pen[] {
    rgb (0.403921568627451, 0.0, 0.12156862745098039) ,
      rgb (0.6980392156862745, 0.09411764705882353, 0.16862745098039217) ,
      rgb (0.8392156862745098, 0.3764705882352941, 0.30196078431372547) ,
      rgb (0.9568627450980393, 0.6470588235294118, 0.5098039215686274) ,
      rgb (0.9921568627450981, 0.8588235294117647, 0.7803921568627451) ,
      rgb (0.9686274509803922, 0.9686274509803922, 0.9686274509803922) ,
      rgb (0.8196078431372549, 0.8980392156862745, 0.9411764705882353) ,
      rgb (0.5725490196078431, 0.7725490196078432, 0.8705882352941177) ,
      rgb (0.2627450980392157, 0.5764705882352941, 0.7647058823529411) ,
      rgb (0.12941176470588237, 0.4, 0.6745098039215687) ,
      rgb (0.0196078431372549, 0.18823529411764706, 0.3803921568627451)
      });


list_data RdGy = list_data(new pen[] {
    rgb (0.403921568627451, 0.0, 0.12156862745098039) ,
      rgb (0.6980392156862745, 0.09411764705882353, 0.16862745098039217) ,
      rgb (0.8392156862745098, 0.3764705882352941, 0.30196078431372547) ,
      rgb (0.9568627450980393, 0.6470588235294118, 0.5098039215686274) ,
      rgb (0.9921568627450981, 0.8588235294117647, 0.7803921568627451) ,
      rgb (1.0, 1.0, 1.0) ,
      rgb (0.8784313725490196, 0.8784313725490196, 0.8784313725490196) ,
      rgb (0.7294117647058823, 0.7294117647058823, 0.7294117647058823) ,
      rgb (0.5294117647058824, 0.5294117647058824, 0.5294117647058824) ,
      rgb (0.30196078431372547, 0.30196078431372547, 0.30196078431372547) ,
      rgb (0.10196078431372549, 0.10196078431372549, 0.10196078431372549)
      });


list_data RdPu = list_data(new pen[] {
    rgb (1.0, 0.9686274509803922, 0.9529411764705882) ,
      rgb (0.9921568627450981, 0.8784313725490196, 0.8666666666666667) ,
      rgb (0.9882352941176471, 0.7725490196078432, 0.7529411764705882) ,
      rgb (0.9803921568627451, 0.6235294117647059, 0.7098039215686275) ,
      rgb (0.9686274509803922, 0.40784313725490196, 0.6313725490196078) ,
      rgb (0.8666666666666667, 0.20392156862745098, 0.592156862745098) ,
      rgb (0.6823529411764706, 0.00392156862745098, 0.49411764705882355) ,
      rgb (0.47843137254901963, 0.00392156862745098, 0.4666666666666667) ,
      rgb (0.28627450980392155, 0.0, 0.41568627450980394)
      });


list_data RdYlBu = list_data(new pen[] {
    rgb (0.6470588235294118, 0.0, 0.14901960784313725) ,
      rgb (0.8431372549019608, 0.18823529411764706, 0.15294117647058825) ,
      rgb (0.9568627450980393, 0.42745098039215684, 0.2627450980392157) ,
      rgb (0.9921568627450981, 0.6823529411764706, 0.3803921568627451) ,
      rgb (0.996078431372549, 0.8784313725490196, 0.5647058823529412) ,
      rgb (1.0, 1.0, 0.7490196078431373) ,
      rgb (0.8784313725490196, 0.9529411764705882, 0.9725490196078431) ,
      rgb (0.6705882352941176, 0.8509803921568627, 0.9137254901960784) ,
      rgb (0.4549019607843137, 0.6784313725490196, 0.8196078431372549) ,
      rgb (0.27058823529411763, 0.4588235294117647, 0.7058823529411765) ,
      rgb (0.19215686274509805, 0.21176470588235294, 0.5843137254901961)
      });


list_data RdYlGn = list_data(new pen[] {
    rgb (0.6470588235294118, 0.0, 0.14901960784313725) ,
      rgb (0.8431372549019608, 0.18823529411764706, 0.15294117647058825) ,
      rgb (0.9568627450980393, 0.42745098039215684, 0.2627450980392157) ,
      rgb (0.9921568627450981, 0.6823529411764706, 0.3803921568627451) ,
      rgb (0.996078431372549, 0.8784313725490196, 0.5450980392156862) ,
      rgb (1.0, 1.0, 0.7490196078431373) ,
      rgb (0.8509803921568627, 0.9372549019607843, 0.5450980392156862) ,
      rgb (0.6509803921568628, 0.8509803921568627, 0.41568627450980394) ,
      rgb (0.4, 0.7411764705882353, 0.38823529411764707) ,
      rgb (0.10196078431372549, 0.596078431372549, 0.3137254901960784) ,
      rgb (0.0, 0.40784313725490196, 0.21568627450980393)
      });


list_data Reds = list_data(new pen[] {
    rgb (1.0, 0.9607843137254902, 0.9411764705882353) ,
      rgb (0.996078431372549, 0.8784313725490196, 0.8235294117647058) ,
      rgb (0.9882352941176471, 0.7333333333333333, 0.6313725490196078) ,
      rgb (0.9882352941176471, 0.5725490196078431, 0.4470588235294118) ,
      rgb (0.984313725490196, 0.41568627450980394, 0.2901960784313726) ,
      rgb (0.9372549019607843, 0.23137254901960785, 0.17254901960784313) ,
      rgb (0.796078431372549, 0.09411764705882353, 0.11372549019607843) ,
      rgb (0.6470588235294118, 0.058823529411764705, 0.08235294117647057) ,
      rgb (0.403921568627451, 0.0, 0.05098039215686274)
      });


list_data Set1 = list_data(new pen[] {
    rgb (0.8941176470588236, 0.10196078431372549, 0.10980392156862745) ,
      rgb (0.21568627450980393, 0.49411764705882355, 0.7215686274509804) ,
      rgb (0.30196078431372547, 0.6862745098039216, 0.2901960784313726) ,
      rgb (0.596078431372549, 0.3058823529411765, 0.6392156862745098) ,
      rgb (1.0, 0.4980392156862745, 0.0) ,
      rgb (1.0, 1.0, 0.2) ,
      rgb (0.6509803921568628, 0.33725490196078434, 0.1568627450980392) ,
      rgb (0.9686274509803922, 0.5058823529411764, 0.7490196078431373) ,
      rgb (0.6, 0.6, 0.6)
      });


list_data Set2 = list_data(new pen[] {
    rgb (0.4, 0.7607843137254902, 0.6470588235294118) ,
      rgb (0.9882352941176471, 0.5529411764705883, 0.3843137254901961) ,
      rgb (0.5529411764705883, 0.6274509803921569, 0.796078431372549) ,
      rgb (0.9058823529411765, 0.5411764705882353, 0.7647058823529411) ,
      rgb (0.6509803921568628, 0.8470588235294118, 0.32941176470588235) ,
      rgb (1.0, 0.8509803921568627, 0.1843137254901961) ,
      rgb (0.8980392156862745, 0.7686274509803922, 0.5803921568627451) ,
      rgb (0.7019607843137254, 0.7019607843137254, 0.7019607843137254)
      });


list_data Set3 = list_data(new pen[] {
    rgb (0.5529411764705883, 0.8274509803921568, 0.7803921568627451) ,
      rgb (1.0, 1.0, 0.7019607843137254) ,
      rgb (0.7450980392156863, 0.7294117647058823, 0.8549019607843137) ,
      rgb (0.984313725490196, 0.5019607843137255, 0.4470588235294118) ,
      rgb (0.5019607843137255, 0.6941176470588235, 0.8274509803921568) ,
      rgb (0.9921568627450981, 0.7058823529411765, 0.3843137254901961) ,
      rgb (0.7019607843137254, 0.8705882352941177, 0.4117647058823529) ,
      rgb (0.9882352941176471, 0.803921568627451, 0.8980392156862745) ,
      rgb (0.8509803921568627, 0.8509803921568627, 0.8509803921568627) ,
      rgb (0.7372549019607844, 0.5019607843137255, 0.7411764705882353) ,
      rgb (0.8, 0.9215686274509803, 0.7725490196078432) ,
      rgb (1.0, 0.9294117647058824, 0.43529411764705883)
      });


list_data Spectral = list_data(new pen[] {
    rgb (0.6196078431372549, 0.00392156862745098, 0.25882352941176473) ,
      rgb (0.8352941176470589, 0.24313725490196078, 0.30980392156862746) ,
      rgb (0.9568627450980393, 0.42745098039215684, 0.2627450980392157) ,
      rgb (0.9921568627450981, 0.6823529411764706, 0.3803921568627451) ,
      rgb (0.996078431372549, 0.8784313725490196, 0.5450980392156862) ,
      rgb (1.0, 1.0, 0.7490196078431373) ,
      rgb (0.9019607843137255, 0.9607843137254902, 0.596078431372549) ,
      rgb (0.6705882352941176, 0.8666666666666667, 0.6431372549019608) ,
      rgb (0.4, 0.7607843137254902, 0.6470588235294118) ,
      rgb (0.19607843137254902, 0.5333333333333333, 0.7411764705882353) ,
      rgb (0.3686274509803922, 0.30980392156862746, 0.6352941176470588)
      });


list_data YlGnBu = list_data(new pen[] {
    rgb (1.0, 1.0, 0.8509803921568627) ,
      rgb (0.9294117647058824, 0.9725490196078431, 0.6941176470588235) ,
      rgb (0.7803921568627451, 0.9137254901960784, 0.7058823529411765) ,
      rgb (0.4980392156862745, 0.803921568627451, 0.7333333333333333) ,
      rgb (0.2549019607843137, 0.7137254901960784, 0.7686274509803922) ,
      rgb (0.11372549019607843, 0.5686274509803921, 0.7529411764705882) ,
      rgb (0.13333333333333333, 0.3686274509803922, 0.6588235294117647) ,
      rgb (0.1450980392156863, 0.20392156862745098, 0.5803921568627451) ,
      rgb (0.03137254901960784, 0.11372549019607843, 0.34509803921568627)
      });


list_data YlGn = list_data(new pen[] {
    rgb (1.0, 1.0, 0.8980392156862745) ,
      rgb (0.9686274509803922, 0.9882352941176471, 0.7254901960784313) ,
      rgb (0.8509803921568627, 0.9411764705882353, 0.6392156862745098) ,
      rgb (0.6784313725490196, 0.8666666666666667, 0.5568627450980392) ,
      rgb (0.47058823529411764, 0.7764705882352941, 0.4745098039215686) ,
      rgb (0.2549019607843137, 0.6705882352941176, 0.36470588235294116) ,
      rgb (0.13725490196078433, 0.5176470588235295, 0.2627450980392157) ,
      rgb (0.0, 0.40784313725490196, 0.21568627450980393) ,
      rgb (0.0, 0.27058823529411763, 0.1607843137254902)
      });


list_data YlOrBr = list_data(new pen[] {
    rgb (1.0, 1.0, 0.8980392156862745) ,
      rgb (1.0, 0.9686274509803922, 0.7372549019607844) ,
      rgb (0.996078431372549, 0.8901960784313725, 0.5686274509803921) ,
      rgb (0.996078431372549, 0.7686274509803922, 0.30980392156862746) ,
      rgb (0.996078431372549, 0.6, 0.1607843137254902) ,
      rgb (0.9254901960784314, 0.4392156862745098, 0.0784313725490196) ,
      rgb (0.8, 0.2980392156862745, 0.00784313725490196) ,
      rgb (0.6, 0.20392156862745098, 0.01568627450980392) ,
      rgb (0.4, 0.1450980392156863, 0.02352941176470588)
      });


list_data YlOrRd = list_data(new pen[] {
    rgb (1.0, 1.0, 0.8) ,
      rgb (1.0, 0.9294117647058824, 0.6274509803921569) ,
      rgb (0.996078431372549, 0.8509803921568627, 0.4627450980392157) ,
      rgb (0.996078431372549, 0.6980392156862745, 0.2980392156862745) ,
      rgb (0.9921568627450981, 0.5529411764705883, 0.23529411764705882) ,
      rgb (0.9882352941176471, 0.3058823529411765, 0.16470588235294117) ,
      rgb (0.8901960784313725, 0.10196078431372549, 0.10980392156862745) ,
      rgb (0.7411764705882353, 0.0, 0.14901960784313725) ,
      rgb (0.5019607843137255, 0.0, 0.14901960784313725)
      });


seg_data autumn = seg_data(
                           new triple[] {  // red
                             (0.0, 1.0, 1.0) ,
                               (1.0, 1.0, 1.0)
                               },
                           new triple[] {  // green
                             (0.0, 0.0, 0.0) ,
                               (1.0, 1.0, 1.0)
                               },
                           new triple[] {  // blue
                             (0.0, 0.0, 0.0) ,
                               (1.0, 0.0, 0.0)
                               }
                           );


seg_data binary = seg_data(
                           new triple[] {  // red
                             (0.0, 1.0, 1.0) ,
                               (1.0, 0.0, 0.0)
                               },
                           new triple[] {  // green
                             (0.0, 1.0, 1.0) ,
                               (1.0, 0.0, 0.0)
                               },
                           new triple[] {  // blue
                             (0.0, 1.0, 1.0) ,
                               (1.0, 0.0, 0.0)
                               }
                           );


seg_data bone = seg_data(
                         new triple[] {  // red
                           (0.0, 0.0, 0.0) ,
                             (0.746032, 0.652778, 0.652778) ,
                             (1.0, 1.0, 1.0)
                             },
                         new triple[] {  // green
                           (0.0, 0.0, 0.0) ,
                             (0.365079, 0.319444, 0.319444) ,
                             (0.746032, 0.777778, 0.777778) ,
                             (1.0, 1.0, 1.0)
                             },
                         new triple[] {  // blue
                           (0.0, 0.0, 0.0) ,
                             (0.365079, 0.444444, 0.444444) ,
                             (1.0, 1.0, 1.0)
                             }
                         );


list_data brg = list_data(new pen[] {
    rgb (0.0, 0.0, 1.0) ,
      rgb (1.0, 0.0, 0.0) ,
      rgb (0.0, 1.0, 0.0)
      });


list_data bwr = list_data(new pen[] {
    rgb (0.0, 0.0, 1.0) ,
      rgb (1.0, 1.0, 1.0) ,
      rgb (1.0, 0.0, 0.0)
      });


seg_data cool = seg_data(
                         new triple[] {  // red
                           (0.0, 0.0, 0.0) ,
                             (1.0, 1.0, 1.0)
                             },
                         new triple[] {  // green
                           (0.0, 1.0, 1.0) ,
                             (1.0, 0.0, 0.0)
                             },
                         new triple[] {  // blue
                           (0.0, 1.0, 1.0) ,
                             (1.0, 1.0, 1.0)
                             }
                         );


seg_data coolwarm = seg_data(
                             new triple[] {  // red
                               (0.0, 0.2298057, 0.2298057) ,
                                 (0.03125, 0.26623388, 0.26623388) ,
                                 (0.0625, 0.30386891, 0.30386891) ,
                                 (0.09375, 0.342804478, 0.342804478) ,
                                 (0.125, 0.38301334, 0.38301334) ,
                                 (0.15625, 0.424369608, 0.424369608) ,
                                 (0.1875, 0.46666708, 0.46666708) ,
                                 (0.21875, 0.509635204, 0.509635204) ,
                                 (0.25, 0.552953156, 0.552953156) ,
                                 (0.28125, 0.596262162, 0.596262162) ,
                                 (0.3125, 0.639176211, 0.639176211) ,
                                 (0.34375, 0.681291281, 0.681291281) ,
                                 (0.375, 0.722193294, 0.722193294) ,
                                 (0.40625, 0.761464949, 0.761464949) ,
                                 (0.4375, 0.798691636, 0.798691636) ,
                                 (0.46875, 0.833466556, 0.833466556) ,
                                 (0.5, 0.865395197, 0.865395197) ,
                                 (0.53125, 0.897787179, 0.897787179) ,
                                 (0.5625, 0.924127593, 0.924127593) ,
                                 (0.59375, 0.944468518, 0.944468518) ,
                                 (0.625, 0.958852946, 0.958852946) ,
                                 (0.65625, 0.96732803, 0.96732803) ,
                                 (0.6875, 0.969954137, 0.969954137) ,
                                 (0.71875, 0.966811177, 0.966811177) ,
                                 (0.75, 0.958003065, 0.958003065) ,
                                 (0.78125, 0.943660866, 0.943660866) ,
                                 (0.8125, 0.923944917, 0.923944917) ,
                                 (0.84375, 0.89904617, 0.89904617) ,
                                 (0.875, 0.869186849, 0.869186849) ,
                                 (0.90625, 0.834620542, 0.834620542) ,
                                 (0.9375, 0.795631745, 0.795631745) ,
                                 (0.96875, 0.752534934, 0.752534934) ,
                                 (1.0, 0.705673158, 0.705673158)
                                 },
                             new triple[] {  // green
                               (0.0, 0.298717966, 0.298717966) ,
                                 (0.03125, 0.353094838, 0.353094838) ,
                                 (0.0625, 0.406535296, 0.406535296) ,
                                 (0.09375, 0.458757618, 0.458757618) ,
                                 (0.125, 0.50941904, 0.50941904) ,
                                 (0.15625, 0.558148092, 0.558148092) ,
                                 (0.1875, 0.604562568, 0.604562568) ,
                                 (0.21875, 0.648280772, 0.648280772) ,
                                 (0.25, 0.688929332, 0.688929332) ,
                                 (0.28125, 0.726149107, 0.726149107) ,
                                 (0.3125, 0.759599947, 0.759599947) ,
                                 (0.34375, 0.788964712, 0.788964712) ,
                                 (0.375, 0.813952739, 0.813952739) ,
                                 (0.40625, 0.834302879, 0.834302879) ,
                                 (0.4375, 0.849786142, 0.849786142) ,
                                 (0.46875, 0.860207984, 0.860207984) ,
                                 (0.5, 0.86541021, 0.86541021) ,
                                 (0.53125, 0.848937047, 0.848937047) ,
                                 (0.5625, 0.827384882, 0.827384882) ,
                                 (0.59375, 0.800927443, 0.800927443) ,
                                 (0.625, 0.769767752, 0.769767752) ,
                                 (0.65625, 0.734132809, 0.734132809) ,
                                 (0.6875, 0.694266682, 0.694266682) ,
                                 (0.71875, 0.650421156, 0.650421156) ,
                                 (0.75, 0.602842431, 0.602842431) ,
                                 (0.78125, 0.551750968, 0.551750968) ,
                                 (0.8125, 0.49730856, 0.49730856) ,
                                 (0.84375, 0.439559467, 0.439559467) ,
                                 (0.875, 0.378313092, 0.378313092) ,
                                 (0.90625, 0.312874446, 0.312874446) ,
                                 (0.9375, 0.24128379, 0.24128379) ,
                                 (0.96875, 0.157246067, 0.157246067) ,
                                 (1.0, 0.01555616, 0.01555616)
                                 },
                             new triple[] {  // blue
                               (0.0, 0.753683153, 0.753683153) ,
                                 (0.03125, 0.801466763, 0.801466763) ,
                                 (0.0625, 0.84495867, 0.84495867) ,
                                 (0.09375, 0.883725899, 0.883725899) ,
                                 (0.125, 0.917387822, 0.917387822) ,
                                 (0.15625, 0.945619588, 0.945619588) ,
                                 (0.1875, 0.968154911, 0.968154911) ,
                                 (0.21875, 0.98478814, 0.98478814) ,
                                 (0.25, 0.995375608, 0.995375608) ,
                                 (0.28125, 0.999836203, 0.999836203) ,
                                 (0.3125, 0.998151185, 0.998151185) ,
                                 (0.34375, 0.990363227, 0.990363227) ,
                                 (0.375, 0.976574709, 0.976574709) ,
                                 (0.40625, 0.956945269, 0.956945269) ,
                                 (0.4375, 0.931688648, 0.931688648) ,
                                 (0.46875, 0.901068838, 0.901068838) ,
                                 (0.5, 0.865395561, 0.865395561) ,
                                 (0.53125, 0.820880546, 0.820880546) ,
                                 (0.5625, 0.774508472, 0.774508472) ,
                                 (0.59375, 0.726736146, 0.726736146) ,
                                 (0.625, 0.678007945, 0.678007945) ,
                                 (0.65625, 0.628751763, 0.628751763) ,
                                 (0.6875, 0.579375448, 0.579375448) ,
                                 (0.71875, 0.530263762, 0.530263762) ,
                                 (0.75, 0.481775914, 0.481775914) ,
                                 (0.78125, 0.434243684, 0.434243684) ,
                                 (0.8125, 0.387970225, 0.387970225) ,
                                 (0.84375, 0.343229596, 0.343229596) ,
                                 (0.875, 0.300267182, 0.300267182) ,
                                 (0.90625, 0.259301199, 0.259301199) ,
                                 (0.9375, 0.220525627, 0.220525627) ,
                                 (0.96875, 0.184115123, 0.184115123) ,
                                 (1.0, 0.150232812, 0.150232812)
                                 }
                             );


seg_data copper = seg_data(
                           new triple[] {  // red
                             (0.0, 0.0, 0.0) ,
                               (0.809524, 1.0, 1.0) ,
                               (1.0, 1.0, 1.0)
                               },
                           new triple[] {  // green
                             (0.0, 0.0, 0.0) ,
                               (1.0, 0.7812, 0.7812)
                               },
                           new triple[] {  // blue
                             (0.0, 0.0, 0.0) ,
                               (1.0, 0.4975, 0.4975)
                               }
                           );


seg_data gist_earth = seg_data(
                               new triple[] {  // red
                                 (0.0, 0.0, 0.0) ,
                                   (0.2824, 0.1882, 0.1882) ,
                                   (0.4588, 0.2714, 0.2714) ,
                                   (0.549, 0.4719, 0.4719) ,
                                   (0.698, 0.7176, 0.7176) ,
                                   (0.7882, 0.7553, 0.7553) ,
                                   (1.0, 0.9922, 0.9922)
                                   },
                               new triple[] {  // green
                                 (0.0, 0.0, 0.0) ,
                                   (0.0275, 0.0, 0.0) ,
                                   (0.1098, 0.1893, 0.1893) ,
                                   (0.1647, 0.3035, 0.3035) ,
                                   (0.2078, 0.3841, 0.3841) ,
                                   (0.2824, 0.502, 0.502) ,
                                   (0.5216, 0.6397, 0.6397) ,
                                   (0.698, 0.7171, 0.7171) ,
                                   (0.7882, 0.6392, 0.6392) ,
                                   (0.7922, 0.6413, 0.6413) ,
                                   (0.8, 0.6447, 0.6447) ,
                                   (0.8078, 0.6481, 0.6481) ,
                                   (0.8157, 0.6549, 0.6549) ,
                                   (0.8667, 0.6991, 0.6991) ,
                                   (0.8745, 0.7103, 0.7103) ,
                                   (0.8824, 0.7216, 0.7216) ,
                                   (0.8902, 0.7323, 0.7323) ,
                                   (0.898, 0.743, 0.743) ,
                                   (0.9412, 0.8275, 0.8275) ,
                                   (0.9569, 0.8635, 0.8635) ,
                                   (0.9647, 0.8816, 0.8816) ,
                                   (0.9961, 0.9733, 0.9733) ,
                                   (1.0, 0.9843, 0.9843)
                                   },
                               new triple[] {  // blue
                                 (0.0, 0.0, 0.0) ,
                                   (0.0039, 0.1684, 0.1684) ,
                                   (0.0078, 0.2212, 0.2212) ,
                                   (0.0275, 0.4329, 0.4329) ,
                                   (0.0314, 0.4549, 0.4549) ,
                                   (0.2824, 0.5004, 0.5004) ,
                                   (0.4667, 0.2748, 0.2748) ,
                                   (0.5451, 0.3205, 0.3205) ,
                                   (0.7843, 0.3961, 0.3961) ,
                                   (0.8941, 0.6651, 0.6651) ,
                                   (1.0, 0.9843, 0.9843)
                                   }
                               );


seg_data gist_ncar = seg_data(
                              new triple[] {  // red
                                (0.0, 0.0, 0.0) ,
                                  (0.3098, 0.0, 0.0) ,
                                  (0.3725, 0.3993, 0.3993) ,
                                  (0.4235, 0.5003, 0.5003) ,
                                  (0.5333, 1.0, 1.0) ,
                                  (0.7922, 1.0, 1.0) ,
                                  (0.8471, 0.6218, 0.6218) ,
                                  (0.898, 0.9235, 0.9235) ,
                                  (1.0, 0.9961, 0.9961)
                                  },
                              new triple[] {  // green
                                (0.0, 0.0, 0.0) ,
                                  (0.051, 0.3722, 0.3722) ,
                                  (0.1059, 0.0, 0.0) ,
                                  (0.1569, 0.7202, 0.7202) ,
                                  (0.1608, 0.7537, 0.7537) ,
                                  (0.1647, 0.7752, 0.7752) ,
                                  (0.2157, 1.0, 1.0) ,
                                  (0.2588, 0.9804, 0.9804) ,
                                  (0.2706, 0.9804, 0.9804) ,
                                  (0.3176, 1.0, 1.0) ,
                                  (0.3686, 0.8081, 0.8081) ,
                                  (0.4275, 1.0, 1.0) ,
                                  (0.5216, 1.0, 1.0) ,
                                  (0.6314, 0.7292, 0.7292) ,
                                  (0.6863, 0.2796, 0.2796) ,
                                  (0.7451, 0.0, 0.0) ,
                                  (0.7922, 0.0, 0.0) ,
                                  (0.8431, 0.1753, 0.1753) ,
                                  (0.898, 0.5, 0.5) ,
                                  (1.0, 0.9725, 0.9725)
                                  },
                              new triple[] {  // blue
                                (0.0, 0.502, 0.502) ,
                                  (0.051, 0.0222, 0.0222) ,
                                  (0.1098, 1.0, 1.0) ,
                                  (0.2039, 1.0, 1.0) ,
                                  (0.2627, 0.6145, 0.6145) ,
                                  (0.3216, 0.0, 0.0) ,
                                  (0.4157, 0.0, 0.0) ,
                                  (0.4745, 0.2342, 0.2342) ,
                                  (0.5333, 0.0, 0.0) ,
                                  (0.5804, 0.0, 0.0) ,
                                  (0.6314, 0.0549, 0.0549) ,
                                  (0.6902, 0.0, 0.0) ,
                                  (0.7373, 0.0, 0.0) ,
                                  (0.7922, 0.9738, 0.9738) ,
                                  (0.8, 1.0, 1.0) ,
                                  (0.8431, 1.0, 1.0) ,
                                  (0.898, 0.9341, 0.9341) ,
                                  (1.0, 0.9961, 0.9961)
                                  }
                              );


seg_data gist_stern = seg_data(
                               new triple[] {  // red
                                 (0.0, 0.0, 0.0) ,
                                   (0.0547, 1.0, 1.0) ,
                                   (0.25, 0.027, 0.25) ,
                                   (1.0, 1.0, 1.0)
                                   },
                               new triple[] {  // green
                                 (0, 0, 0) ,
                                   (1, 1, 1)
                                   },
                               new triple[] {  // blue
                                 (0.0, 0.0, 0.0) ,
                                   (0.5, 1.0, 1.0) ,
                                   (0.735, 0.0, 0.0) ,
                                   (1.0, 1.0, 1.0)
                                   }
                               );


seg_data gray = seg_data(
                         new triple[] {  // red
                           (0.0, 0, 0) ,
                             (1.0, 1, 1)
                             },
                         new triple[] {  // green
                           (0.0, 0, 0) ,
                             (1.0, 1, 1)
                             },
                         new triple[] {  // blue
                           (0.0, 0, 0) ,
                             (1.0, 1, 1)
                             }
                         );


seg_data hot = seg_data(
                        new triple[] {  // red
                          (0.0, 0.0416, 0.0416) ,
                            (0.365079, 1.0, 1.0) ,
                            (1.0, 1.0, 1.0)
                            },
                        new triple[] {  // green
                          (0.0, 0.0, 0.0) ,
                            (0.365079, 0.0, 0.0) ,
                            (0.746032, 1.0, 1.0) ,
                            (1.0, 1.0, 1.0)
                            },
                        new triple[] {  // blue
                          (0.0, 0.0, 0.0) ,
                            (0.746032, 0.0, 0.0) ,
                            (1.0, 1.0, 1.0)
                            }
                        );


seg_data hsv = seg_data(
                        new triple[] {  // red
                          (0.0, 1.0, 1.0) ,
                            (0.15873, 1.0, 1.0) ,
                            (0.174603, 0.96875, 0.96875) ,
                            (0.333333, 0.03125, 0.03125) ,
                            (0.349206, 0.0, 0.0) ,
                            (0.666667, 0.0, 0.0) ,
                            (0.68254, 0.03125, 0.03125) ,
                            (0.84127, 0.96875, 0.96875) ,
                            (0.857143, 1.0, 1.0) ,
                            (1.0, 1.0, 1.0)
                            },
                        new triple[] {  // green
                          (0.0, 0.0, 0.0) ,
                            (0.15873, 0.9375, 0.9375) ,
                            (0.174603, 1.0, 1.0) ,
                            (0.507937, 1.0, 1.0) ,
                            (0.666667, 0.0625, 0.0625) ,
                            (0.68254, 0.0, 0.0) ,
                            (1.0, 0.0, 0.0)
                            },
                        new triple[] {  // blue
                          (0.0, 0.0, 0.0) ,
                            (0.333333, 0.0, 0.0) ,
                            (0.349206, 0.0625, 0.0625) ,
                            (0.507937, 1.0, 1.0) ,
                            (0.84127, 1.0, 1.0) ,
                            (0.857143, 0.9375, 0.9375) ,
                            (1.0, 0.09375, 0.09375)
                            }
                        );


seg_data jet = seg_data(
                        new triple[] {  // red
                          (0.0, 0, 0) ,
                            (0.35, 0, 0) ,
                            (0.66, 1, 1) ,
                            (0.89, 1, 1) ,
                            (1, 0.5, 0.5)
                            },
                        new triple[] {  // green
                          (0.0, 0, 0) ,
                            (0.125, 0, 0) ,
                            (0.375, 1, 1) ,
                            (0.64, 1, 1) ,
                            (0.91, 0, 0) ,
                            (1, 0, 0)
                            },
                        new triple[] {  // blue
                          (0.0, 0.5, 0.5) ,
                            (0.11, 1, 1) ,
                            (0.34, 1, 1) ,
                            (0.65, 0, 0) ,
                            (1, 0, 0)
                            }
                        );


seg_data nipy_spectral = seg_data(
                                  new triple[] {  // red
                                    (0.0, 0.0, 0.0) ,
                                      (0.05, 0.4667, 0.4667) ,
                                      (0.1, 0.5333, 0.5333) ,
                                      (0.15, 0.0, 0.0) ,
                                      (0.2, 0.0, 0.0) ,
                                      (0.25, 0.0, 0.0) ,
                                      (0.3, 0.0, 0.0) ,
                                      (0.35, 0.0, 0.0) ,
                                      (0.4, 0.0, 0.0) ,
                                      (0.45, 0.0, 0.0) ,
                                      (0.5, 0.0, 0.0) ,
                                      (0.55, 0.0, 0.0) ,
                                      (0.6, 0.0, 0.0) ,
                                      (0.65, 0.7333, 0.7333) ,
                                      (0.7, 0.9333, 0.9333) ,
                                      (0.75, 1.0, 1.0) ,
                                      (0.8, 1.0, 1.0) ,
                                      (0.85, 1.0, 1.0) ,
                                      (0.9, 0.8667, 0.8667) ,
                                      (0.95, 0.8, 0.8) ,
                                      (1.0, 0.8, 0.8)
                                      },
                                  new triple[] {  // green
                                    (0.0, 0.0, 0.0) ,
                                      (0.05, 0.0, 0.0) ,
                                      (0.1, 0.0, 0.0) ,
                                      (0.15, 0.0, 0.0) ,
                                      (0.2, 0.0, 0.0) ,
                                      (0.25, 0.4667, 0.4667) ,
                                      (0.3, 0.6, 0.6) ,
                                      (0.35, 0.6667, 0.6667) ,
                                      (0.4, 0.6667, 0.6667) ,
                                      (0.45, 0.6, 0.6) ,
                                      (0.5, 0.7333, 0.7333) ,
                                      (0.55, 0.8667, 0.8667) ,
                                      (0.6, 1.0, 1.0) ,
                                      (0.65, 1.0, 1.0) ,
                                      (0.7, 0.9333, 0.9333) ,
                                      (0.75, 0.8, 0.8) ,
                                      (0.8, 0.6, 0.6) ,
                                      (0.85, 0.0, 0.0) ,
                                      (0.9, 0.0, 0.0) ,
                                      (0.95, 0.0, 0.0) ,
                                      (1.0, 0.8, 0.8)
                                      },
                                  new triple[] {  // blue
                                    (0.0, 0.0, 0.0) ,
                                      (0.05, 0.5333, 0.5333) ,
                                      (0.1, 0.6, 0.6) ,
                                      (0.15, 0.6667, 0.6667) ,
                                      (0.2, 0.8667, 0.8667) ,
                                      (0.25, 0.8667, 0.8667) ,
                                      (0.3, 0.8667, 0.8667) ,
                                      (0.35, 0.6667, 0.6667) ,
                                      (0.4, 0.5333, 0.5333) ,
                                      (0.45, 0.0, 0.0) ,
                                      (0.5, 0.0, 0.0) ,
                                      (0.55, 0.0, 0.0) ,
                                      (0.6, 0.0, 0.0) ,
                                      (0.65, 0.0, 0.0) ,
                                      (0.7, 0.0, 0.0) ,
                                      (0.75, 0.0, 0.0) ,
                                      (0.8, 0.0, 0.0) ,
                                      (0.85, 0.0, 0.0) ,
                                      (0.9, 0.0, 0.0) ,
                                      (0.95, 0.0, 0.0) ,
                                      (1.0, 0.8, 0.8)
                                      }
                                  );


seg_data pink = seg_data(
                         new triple[] {  // red
                           (0.0, 0.1178, 0.1178) ,
                             (0.015873, 0.195857, 0.195857) ,
                             (0.031746, 0.250661, 0.250661) ,
                             (0.047619, 0.295468, 0.295468) ,
                             (0.063492, 0.334324, 0.334324) ,
                             (0.079365, 0.369112, 0.369112) ,
                             (0.095238, 0.400892, 0.400892) ,
                             (0.111111, 0.430331, 0.430331) ,
                             (0.126984, 0.457882, 0.457882) ,
                             (0.142857, 0.483867, 0.483867) ,
                             (0.15873, 0.508525, 0.508525) ,
                             (0.174603, 0.532042, 0.532042) ,
                             (0.190476, 0.554563, 0.554563) ,
                             (0.206349, 0.576204, 0.576204) ,
                             (0.222222, 0.597061, 0.597061) ,
                             (0.238095, 0.617213, 0.617213) ,
                             (0.253968, 0.636729, 0.636729) ,
                             (0.269841, 0.655663, 0.655663) ,
                             (0.285714, 0.674066, 0.674066) ,
                             (0.301587, 0.69198, 0.69198) ,
                             (0.31746, 0.709441, 0.709441) ,
                             (0.333333, 0.726483, 0.726483) ,
                             (0.349206, 0.743134, 0.743134) ,
                             (0.365079, 0.759421, 0.759421) ,
                             (0.380952, 0.766356, 0.766356) ,
                             (0.396825, 0.773229, 0.773229) ,
                             (0.412698, 0.780042, 0.780042) ,
                             (0.428571, 0.786796, 0.786796) ,
                             (0.444444, 0.793492, 0.793492) ,
                             (0.460317, 0.800132, 0.800132) ,
                             (0.47619, 0.806718, 0.806718) ,
                             (0.492063, 0.81325, 0.81325) ,
                             (0.507937, 0.81973, 0.81973) ,
                             (0.52381, 0.82616, 0.82616) ,
                             (0.539683, 0.832539, 0.832539) ,
                             (0.555556, 0.83887, 0.83887) ,
                             (0.571429, 0.845154, 0.845154) ,
                             (0.587302, 0.851392, 0.851392) ,
                             (0.603175, 0.857584, 0.857584) ,
                             (0.619048, 0.863731, 0.863731) ,
                             (0.634921, 0.869835, 0.869835) ,
                             (0.650794, 0.875897, 0.875897) ,
                             (0.666667, 0.881917, 0.881917) ,
                             (0.68254, 0.887896, 0.887896) ,
                             (0.698413, 0.893835, 0.893835) ,
                             (0.714286, 0.899735, 0.899735) ,
                             (0.730159, 0.905597, 0.905597) ,
                             (0.746032, 0.911421, 0.911421) ,
                             (0.761905, 0.917208, 0.917208) ,
                             (0.777778, 0.922958, 0.922958) ,
                             (0.793651, 0.928673, 0.928673) ,
                             (0.809524, 0.934353, 0.934353) ,
                             (0.825397, 0.939999, 0.939999) ,
                             (0.84127, 0.945611, 0.945611) ,
                             (0.857143, 0.95119, 0.95119) ,
                             (0.873016, 0.956736, 0.956736) ,
                             (0.888889, 0.96225, 0.96225) ,
                             (0.904762, 0.967733, 0.967733) ,
                             (0.920635, 0.973185, 0.973185) ,
                             (0.936508, 0.978607, 0.978607) ,
                             (0.952381, 0.983999, 0.983999) ,
                             (0.968254, 0.989361, 0.989361) ,
                             (0.984127, 0.994695, 0.994695) ,
                             (1.0, 1.0, 1.0)
                             },
                         new triple[] {  // green
                           (0.0, 0.0, 0.0) ,
                             (0.015873, 0.102869, 0.102869) ,
                             (0.031746, 0.145479, 0.145479) ,
                             (0.047619, 0.178174, 0.178174) ,
                             (0.063492, 0.205738, 0.205738) ,
                             (0.079365, 0.230022, 0.230022) ,
                             (0.095238, 0.251976, 0.251976) ,
                             (0.111111, 0.272166, 0.272166) ,
                             (0.126984, 0.290957, 0.290957) ,
                             (0.142857, 0.308607, 0.308607) ,
                             (0.15873, 0.3253, 0.3253) ,
                             (0.174603, 0.341178, 0.341178) ,
                             (0.190476, 0.356348, 0.356348) ,
                             (0.206349, 0.370899, 0.370899) ,
                             (0.222222, 0.3849, 0.3849) ,
                             (0.238095, 0.39841, 0.39841) ,
                             (0.253968, 0.411476, 0.411476) ,
                             (0.269841, 0.424139, 0.424139) ,
                             (0.285714, 0.436436, 0.436436) ,
                             (0.301587, 0.448395, 0.448395) ,
                             (0.31746, 0.460044, 0.460044) ,
                             (0.333333, 0.471405, 0.471405) ,
                             (0.349206, 0.482498, 0.482498) ,
                             (0.365079, 0.493342, 0.493342) ,
                             (0.380952, 0.517549, 0.517549) ,
                             (0.396825, 0.540674, 0.540674) ,
                             (0.412698, 0.562849, 0.562849) ,
                             (0.428571, 0.584183, 0.584183) ,
                             (0.444444, 0.604765, 0.604765) ,
                             (0.460317, 0.624669, 0.624669) ,
                             (0.47619, 0.643958, 0.643958) ,
                             (0.492063, 0.662687, 0.662687) ,
                             (0.507937, 0.6809, 0.6809) ,
                             (0.52381, 0.698638, 0.698638) ,
                             (0.539683, 0.715937, 0.715937) ,
                             (0.555556, 0.732828, 0.732828) ,
                             (0.571429, 0.749338, 0.749338) ,
                             (0.587302, 0.765493, 0.765493) ,
                             (0.603175, 0.781313, 0.781313) ,
                             (0.619048, 0.796819, 0.796819) ,
                             (0.634921, 0.812029, 0.812029) ,
                             (0.650794, 0.82696, 0.82696) ,
                             (0.666667, 0.841625, 0.841625) ,
                             (0.68254, 0.85604, 0.85604) ,
                             (0.698413, 0.870216, 0.870216) ,
                             (0.714286, 0.884164, 0.884164) ,
                             (0.730159, 0.897896, 0.897896) ,
                             (0.746032, 0.911421, 0.911421) ,
                             (0.761905, 0.917208, 0.917208) ,
                             (0.777778, 0.922958, 0.922958) ,
                             (0.793651, 0.928673, 0.928673) ,
                             (0.809524, 0.934353, 0.934353) ,
                             (0.825397, 0.939999, 0.939999) ,
                             (0.84127, 0.945611, 0.945611) ,
                             (0.857143, 0.95119, 0.95119) ,
                             (0.873016, 0.956736, 0.956736) ,
                             (0.888889, 0.96225, 0.96225) ,
                             (0.904762, 0.967733, 0.967733) ,
                             (0.920635, 0.973185, 0.973185) ,
                             (0.936508, 0.978607, 0.978607) ,
                             (0.952381, 0.983999, 0.983999) ,
                             (0.968254, 0.989361, 0.989361) ,
                             (0.984127, 0.994695, 0.994695) ,
                             (1.0, 1.0, 1.0)
                             },
                         new triple[] {  // blue
                           (0.0, 0.0, 0.0) ,
                             (0.015873, 0.102869, 0.102869) ,
                             (0.031746, 0.145479, 0.145479) ,
                             (0.047619, 0.178174, 0.178174) ,
                             (0.063492, 0.205738, 0.205738) ,
                             (0.079365, 0.230022, 0.230022) ,
                             (0.095238, 0.251976, 0.251976) ,
                             (0.111111, 0.272166, 0.272166) ,
                             (0.126984, 0.290957, 0.290957) ,
                             (0.142857, 0.308607, 0.308607) ,
                             (0.15873, 0.3253, 0.3253) ,
                             (0.174603, 0.341178, 0.341178) ,
                             (0.190476, 0.356348, 0.356348) ,
                             (0.206349, 0.370899, 0.370899) ,
                             (0.222222, 0.3849, 0.3849) ,
                             (0.238095, 0.39841, 0.39841) ,
                             (0.253968, 0.411476, 0.411476) ,
                             (0.269841, 0.424139, 0.424139) ,
                             (0.285714, 0.436436, 0.436436) ,
                             (0.301587, 0.448395, 0.448395) ,
                             (0.31746, 0.460044, 0.460044) ,
                             (0.333333, 0.471405, 0.471405) ,
                             (0.349206, 0.482498, 0.482498) ,
                             (0.365079, 0.493342, 0.493342) ,
                             (0.380952, 0.503953, 0.503953) ,
                             (0.396825, 0.514344, 0.514344) ,
                             (0.412698, 0.524531, 0.524531) ,
                             (0.428571, 0.534522, 0.534522) ,
                             (0.444444, 0.544331, 0.544331) ,
                             (0.460317, 0.553966, 0.553966) ,
                             (0.47619, 0.563436, 0.563436) ,
                             (0.492063, 0.57275, 0.57275) ,
                             (0.507937, 0.581914, 0.581914) ,
                             (0.52381, 0.590937, 0.590937) ,
                             (0.539683, 0.599824, 0.599824) ,
                             (0.555556, 0.608581, 0.608581) ,
                             (0.571429, 0.617213, 0.617213) ,
                             (0.587302, 0.625727, 0.625727) ,
                             (0.603175, 0.634126, 0.634126) ,
                             (0.619048, 0.642416, 0.642416) ,
                             (0.634921, 0.6506, 0.6506) ,
                             (0.650794, 0.658682, 0.658682) ,
                             (0.666667, 0.666667, 0.666667) ,
                             (0.68254, 0.674556, 0.674556) ,
                             (0.698413, 0.682355, 0.682355) ,
                             (0.714286, 0.690066, 0.690066) ,
                             (0.730159, 0.697691, 0.697691) ,
                             (0.746032, 0.705234, 0.705234) ,
                             (0.761905, 0.727166, 0.727166) ,
                             (0.777778, 0.748455, 0.748455) ,
                             (0.793651, 0.769156, 0.769156) ,
                             (0.809524, 0.789314, 0.789314) ,
                             (0.825397, 0.808969, 0.808969) ,
                             (0.84127, 0.828159, 0.828159) ,
                             (0.857143, 0.846913, 0.846913) ,
                             (0.873016, 0.865261, 0.865261) ,
                             (0.888889, 0.883229, 0.883229) ,
                             (0.904762, 0.900837, 0.900837) ,
                             (0.920635, 0.918109, 0.918109) ,
                             (0.936508, 0.935061, 0.935061) ,
                             (0.952381, 0.951711, 0.951711) ,
                             (0.968254, 0.968075, 0.968075) ,
                             (0.984127, 0.984167, 0.984167) ,
                             (1.0, 1.0, 1.0)
                             }
                         );


list_data seismic = list_data(new pen[] {
    rgb (0.0, 0.0, 0.3) ,
      rgb (0.0, 0.0, 1.0) ,
      rgb (1.0, 1.0, 1.0) ,
      rgb (1.0, 0.0, 0.0) ,
      rgb (0.5, 0.0, 0.0)
      });


seg_data spring = seg_data(
                           new triple[] {  // red
                             (0.0, 1.0, 1.0) ,
                               (1.0, 1.0, 1.0)
                               },
                           new triple[] {  // green
                             (0.0, 0.0, 0.0) ,
                               (1.0, 1.0, 1.0)
                               },
                           new triple[] {  // blue
                             (0.0, 1.0, 1.0) ,
                               (1.0, 0.0, 0.0)
                               }
                           );


seg_data summer = seg_data(
                           new triple[] {  // red
                             (0.0, 0.0, 0.0) ,
                               (1.0, 1.0, 1.0)
                               },
                           new triple[] {  // green
                             (0.0, 0.5, 0.5) ,
                               (1.0, 1.0, 1.0)
                               },
                           new triple[] {  // blue
                             (0.0, 0.4, 0.4) ,
                               (1.0, 0.4, 0.4)
                               }
                           );


list_data tab10 = list_data(new pen[] {
    rgb (0.12156862745098039, 0.4666666666666667, 0.7058823529411765) ,
      rgb (1.0, 0.4980392156862745, 0.054901960784313725) ,
      rgb (0.17254901960784313, 0.6274509803921569, 0.17254901960784313) ,
      rgb (0.8392156862745098, 0.15294117647058825, 0.1568627450980392) ,
      rgb (0.5803921568627451, 0.403921568627451, 0.7411764705882353) ,
      rgb (0.5490196078431373, 0.33725490196078434, 0.29411764705882354) ,
      rgb (0.8901960784313725, 0.4666666666666667, 0.7607843137254902) ,
      rgb (0.4980392156862745, 0.4980392156862745, 0.4980392156862745) ,
      rgb (0.7372549019607844, 0.7411764705882353, 0.13333333333333333) ,
      rgb (0.09019607843137255, 0.7450980392156863, 0.8117647058823529)
      });


list_data tab20 = list_data(new pen[] {
    rgb (0.12156862745098039, 0.4666666666666667, 0.7058823529411765) ,
      rgb (0.6823529411764706, 0.7803921568627451, 0.9098039215686274) ,
      rgb (1.0, 0.4980392156862745, 0.054901960784313725) ,
      rgb (1.0, 0.7333333333333333, 0.47058823529411764) ,
      rgb (0.17254901960784313, 0.6274509803921569, 0.17254901960784313) ,
      rgb (0.596078431372549, 0.8745098039215686, 0.5411764705882353) ,
      rgb (0.8392156862745098, 0.15294117647058825, 0.1568627450980392) ,
      rgb (1.0, 0.596078431372549, 0.5882352941176471) ,
      rgb (0.5803921568627451, 0.403921568627451, 0.7411764705882353) ,
      rgb (0.7725490196078432, 0.6901960784313725, 0.8352941176470589) ,
      rgb (0.5490196078431373, 0.33725490196078434, 0.29411764705882354) ,
      rgb (0.7686274509803922, 0.611764705882353, 0.5803921568627451) ,
      rgb (0.8901960784313725, 0.4666666666666667, 0.7607843137254902) ,
      rgb (0.9686274509803922, 0.7137254901960784, 0.8235294117647058) ,
      rgb (0.4980392156862745, 0.4980392156862745, 0.4980392156862745) ,
      rgb (0.7803921568627451, 0.7803921568627451, 0.7803921568627451) ,
      rgb (0.7372549019607844, 0.7411764705882353, 0.13333333333333333) ,
      rgb (0.8588235294117647, 0.8588235294117647, 0.5529411764705883) ,
      rgb (0.09019607843137255, 0.7450980392156863, 0.8117647058823529) ,
      rgb (0.6196078431372549, 0.8549019607843137, 0.8980392156862745)
      });


list_data tab20b = list_data(new pen[] {
    rgb (0.2235294117647059, 0.23137254901960785, 0.4745098039215686) ,
      rgb (0.3215686274509804, 0.32941176470588235, 0.6392156862745098) ,
      rgb (0.4196078431372549, 0.43137254901960786, 0.8117647058823529) ,
      rgb (0.611764705882353, 0.6196078431372549, 0.8705882352941177) ,
      rgb (0.38823529411764707, 0.4745098039215686, 0.2235294117647059) ,
      rgb (0.5490196078431373, 0.6352941176470588, 0.3215686274509804) ,
      rgb (0.7098039215686275, 0.8117647058823529, 0.4196078431372549) ,
      rgb (0.807843137254902, 0.8588235294117647, 0.611764705882353) ,
      rgb (0.5490196078431373, 0.42745098039215684, 0.19215686274509805) ,
      rgb (0.7411764705882353, 0.6196078431372549, 0.2235294117647059) ,
      rgb (0.9058823529411765, 0.7294117647058823, 0.3215686274509804) ,
      rgb (0.9058823529411765, 0.796078431372549, 0.5803921568627451) ,
      rgb (0.5176470588235295, 0.23529411764705882, 0.2235294117647059) ,
      rgb (0.6784313725490196, 0.28627450980392155, 0.2901960784313726) ,
      rgb (0.8392156862745098, 0.3803921568627451, 0.4196078431372549) ,
      rgb (0.9058823529411765, 0.5882352941176471, 0.611764705882353) ,
      rgb (0.4823529411764706, 0.2549019607843137, 0.45098039215686275) ,
      rgb (0.6470588235294118, 0.3176470588235294, 0.5803921568627451) ,
      rgb (0.807843137254902, 0.42745098039215684, 0.7411764705882353) ,
      rgb (0.8705882352941177, 0.6196078431372549, 0.8392156862745098)
      });


list_data tab20c = list_data(new pen[] {
    rgb (0.19215686274509805, 0.5098039215686274, 0.7411764705882353) ,
      rgb (0.4196078431372549, 0.6823529411764706, 0.8392156862745098) ,
      rgb (0.6196078431372549, 0.792156862745098, 0.8823529411764706) ,
      rgb (0.7764705882352941, 0.8588235294117647, 0.9372549019607843) ,
      rgb (0.9019607843137255, 0.3333333333333333, 0.050980392156862744) ,
      rgb (0.9921568627450981, 0.5529411764705883, 0.23529411764705882) ,
      rgb (0.9921568627450981, 0.6823529411764706, 0.4196078431372549) ,
      rgb (0.9921568627450981, 0.8156862745098039, 0.6352941176470588) ,
      rgb (0.19215686274509805, 0.6392156862745098, 0.32941176470588235) ,
      rgb (0.4549019607843137, 0.7686274509803922, 0.4627450980392157) ,
      rgb (0.6313725490196078, 0.8509803921568627, 0.6078431372549019) ,
      rgb (0.7803921568627451, 0.9137254901960784, 0.7529411764705882) ,
      rgb (0.4588235294117647, 0.4196078431372549, 0.6941176470588235) ,
      rgb (0.6196078431372549, 0.6039215686274509, 0.7843137254901961) ,
      rgb (0.7372549019607844, 0.7411764705882353, 0.8627450980392157) ,
      rgb (0.8549019607843137, 0.8549019607843137, 0.9215686274509803) ,
      rgb (0.38823529411764707, 0.38823529411764707, 0.38823529411764707) ,
      rgb (0.5882352941176471, 0.5882352941176471, 0.5882352941176471) ,
      rgb (0.7411764705882353, 0.7411764705882353, 0.7411764705882353) ,
      rgb (0.8509803921568627, 0.8509803921568627, 0.8509803921568627)
      });


seg_data winter = seg_data(
                           new triple[] {  // red
                             (0.0, 0.0, 0.0) ,
                               (1.0, 0.0, 0.0)
                               },
                           new triple[] {  // green
                             (0.0, 0.0, 0.0) ,
                               (1.0, 1.0, 1.0)
                               },
                           new triple[] {  // blue
                             (0.0, 1.0, 1.0) ,
                               (1.0, 0.5, 0.5)
                               }
                           );


seg_data wistia = seg_data(
                           new triple[] {  // red
                             (0.0, 0.8941176470588236, 0.8941176470588236) ,
                               (0.25, 1.0, 1.0) ,
                               (0.5, 1.0, 1.0) ,
                               (0.75, 1.0, 1.0) ,
                               (1.0, 0.9882352941176471, 0.9882352941176471)
                               },
                           new triple[] {  // green
                             (0.0, 1.0, 1.0) ,
                               (0.25, 0.9098039215686274, 0.9098039215686274) ,
                               (0.5, 0.7411764705882353, 0.7411764705882353) ,
                               (0.75, 0.6274509803921569, 0.6274509803921569) ,
                               (1.0, 0.4980392156862745, 0.4980392156862745)
                               },
                           new triple[] {  // blue
                             (0.0, 0.47843137254901963, 0.47843137254901963) ,
                               (0.25, 0.10196078431372549, 0.10196078431372549) ,
                               (0.5, 0.0, 0.0) ,
                               (0.75, 0.0, 0.0) ,
                               (1.0, 0.0, 0.0)
                               }
                           );


list_data cividis = list_data(new pen[] {
    rgb (0.0, 0.135112, 0.304751) ,
      rgb (0.0, 0.138068, 0.311105) ,
      rgb (0.0, 0.141013, 0.317579) ,
      rgb (0.0, 0.143951, 0.323982) ,
      rgb (0.0, 0.146877, 0.330479) ,
      rgb (0.0, 0.149791, 0.337065) ,
      rgb (0.0, 0.152673, 0.343704) ,
      rgb (0.0, 0.155377, 0.3505) ,
      rgb (0.0, 0.157932, 0.357521) ,
      rgb (0.0, 0.160495, 0.364534) ,
      rgb (0.0, 0.163058, 0.371608) ,
      rgb (0.0, 0.165621, 0.378769) ,
      rgb (0.0, 0.168204, 0.385902) ,
      rgb (0.0, 0.1708, 0.3931) ,
      rgb (0.0, 0.17342, 0.400353) ,
      rgb (0.0, 0.176082, 0.407577) ,
      rgb (0.0, 0.178802, 0.414764) ,
      rgb (0.0, 0.18161, 0.421859) ,
      rgb (0.0, 0.18455, 0.428802) ,
      rgb (0.0, 0.186915, 0.435532) ,
      rgb (0.0, 0.188769, 0.439563) ,
      rgb (0.0, 0.19095, 0.441085) ,
      rgb (0.0, 0.193366, 0.441561) ,
      rgb (0.003602, 0.195911, 0.441564) ,
      rgb (0.017852, 0.198528, 0.441248) ,
      rgb (0.03211, 0.201199, 0.440785) ,
      rgb (0.046205, 0.203903, 0.440196) ,
      rgb (0.058378, 0.206629, 0.439531) ,
      rgb (0.068968, 0.209372, 0.438863) ,
      rgb (0.078624, 0.212122, 0.438105) ,
      rgb (0.087465, 0.214879, 0.437342) ,
      rgb (0.095645, 0.217643, 0.436593) ,
      rgb (0.103401, 0.220406, 0.43579) ,
      rgb (0.110658, 0.22317, 0.435067) ,
      rgb (0.117612, 0.225935, 0.434308) ,
      rgb (0.124291, 0.228697, 0.433547) ,
      rgb (0.130669, 0.231458, 0.43284) ,
      rgb (0.13683, 0.234216, 0.432148) ,
      rgb (0.142852, 0.236972, 0.431404) ,
      rgb (0.148638, 0.239724, 0.430752) ,
      rgb (0.154261, 0.242475, 0.43012) ,
      rgb (0.159733, 0.245221, 0.429528) ,
      rgb (0.165113, 0.247965, 0.428908) ,
      rgb (0.170362, 0.250707, 0.428325) ,
      rgb (0.17549, 0.253444, 0.42779) ,
      rgb (0.180503, 0.25618, 0.427299) ,
      rgb (0.185453, 0.258914, 0.426788) ,
      rgb (0.190303, 0.261644, 0.426329) ,
      rgb (0.195057, 0.264372, 0.425924) ,
      rgb (0.199764, 0.267099, 0.425497) ,
      rgb (0.204385, 0.269823, 0.425126) ,
      rgb (0.208926, 0.272546, 0.424809) ,
      rgb (0.213431, 0.275266, 0.42448) ,
      rgb (0.217863, 0.277985, 0.424206) ,
      rgb (0.222264, 0.280702, 0.423914) ,
      rgb (0.226598, 0.283419, 0.423678) ,
      rgb (0.230871, 0.286134, 0.423498) ,
      rgb (0.23512, 0.288848, 0.423304) ,
      rgb (0.239312, 0.291562, 0.423167) ,
      rgb (0.243485, 0.294274, 0.423014) ,
      rgb (0.247605, 0.296986, 0.422917) ,
      rgb (0.251675, 0.299698, 0.422873) ,
      rgb (0.255731, 0.302409, 0.422814) ,
      rgb (0.25974, 0.30512, 0.42281) ,
      rgb (0.263738, 0.307831, 0.422789) ,
      rgb (0.267693, 0.310542, 0.422821) ,
      rgb (0.271639, 0.313253, 0.422837) ,
      rgb (0.275513, 0.315965, 0.422979) ,
      rgb (0.279411, 0.318677, 0.423031) ,
      rgb (0.28324, 0.32139, 0.423211) ,
      rgb (0.287065, 0.324103, 0.423373) ,
      rgb (0.290884, 0.326816, 0.423517) ,
      rgb (0.294669, 0.329531, 0.423716) ,
      rgb (0.298421, 0.332247, 0.423973) ,
      rgb (0.302169, 0.334963, 0.424213) ,
      rgb (0.305886, 0.337681, 0.424512) ,
      rgb (0.309601, 0.340399, 0.42479) ,
      rgb (0.313287, 0.34312, 0.42512) ,
      rgb (0.316941, 0.345842, 0.425512) ,
      rgb (0.320595, 0.348565, 0.425889) ,
      rgb (0.32425, 0.351289, 0.42625) ,
      rgb (0.327875, 0.354016, 0.42667) ,
      rgb (0.331474, 0.356744, 0.427144) ,
      rgb (0.335073, 0.359474, 0.427605) ,
      rgb (0.338673, 0.362206, 0.428053) ,
      rgb (0.342246, 0.364939, 0.428559) ,
      rgb (0.345793, 0.367676, 0.429127) ,
      rgb (0.349341, 0.370414, 0.429685) ,
      rgb (0.352892, 0.373153, 0.430226) ,
      rgb (0.356418, 0.375896, 0.430823) ,
      rgb (0.359916, 0.378641, 0.431501) ,
      rgb (0.363446, 0.381388, 0.432075) ,
      rgb (0.366923, 0.384139, 0.432796) ,
      rgb (0.37043, 0.38689, 0.433428) ,
      rgb (0.373884, 0.389646, 0.434209) ,
      rgb (0.377371, 0.392404, 0.43489) ,
      rgb (0.38083, 0.395164, 0.435653) ,
      rgb (0.384268, 0.397928, 0.436475) ,
      rgb (0.387705, 0.400694, 0.437305) ,
      rgb (0.391151, 0.403464, 0.438096) ,
      rgb (0.394568, 0.406236, 0.438986) ,
      rgb (0.397991, 0.409011, 0.439848) ,
      rgb (0.401418, 0.41179, 0.440708) ,
      rgb (0.40482, 0.414572, 0.441642) ,
      rgb (0.408226, 0.417357, 0.44257) ,
      rgb (0.411607, 0.420145, 0.443577) ,
      rgb (0.414992, 0.422937, 0.444578) ,
      rgb (0.418383, 0.425733, 0.44556) ,
      rgb (0.421748, 0.428531, 0.44664) ,
      rgb (0.42512, 0.431334, 0.447692) ,
      rgb (0.428462, 0.43414, 0.448864) ,
      rgb (0.431817, 0.43695, 0.449982) ,
      rgb (0.435168, 0.439763, 0.451134) ,
      rgb (0.438504, 0.44258, 0.452341) ,
      rgb (0.44181, 0.445402, 0.453659) ,
      rgb (0.445148, 0.448226, 0.454885) ,
      rgb (0.448447, 0.451053, 0.456264) ,
      rgb (0.451759, 0.453887, 0.457582) ,
      rgb (0.455072, 0.456718, 0.458976) ,
      rgb (0.458366, 0.459552, 0.460457) ,
      rgb (0.461616, 0.462405, 0.461969) ,
      rgb (0.464947, 0.465241, 0.463395) ,
      rgb (0.468254, 0.468083, 0.464908) ,
      rgb (0.471501, 0.47096, 0.466357) ,
      rgb (0.474812, 0.473832, 0.467681) ,
      rgb (0.478186, 0.476699, 0.468845) ,
      rgb (0.481622, 0.479573, 0.469767) ,
      rgb (0.485141, 0.482451, 0.470384) ,
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