SIMPLE = T / UV FORMAT FROM NRAO(CV) IS T! BITPIX = 16 / 2-BYTE TWOS COMPL INTEGERS NAXIS = 6 / NUMBER OF AXES NAXIS1 = 0 / NO NORMAL IMAGE IN GROUPS NAXIS2 = 2 / # COMPLEX: REAL,IMAGINARY NAXIS3 = 4 / # STOKES PARS: I,Q,U,V NAXIS4 = 1 / # FREQUENCIES (CONTINUUM HERE) NAXIS5 = 1 / # RA(1950) NAXIS6 = 1 / # DEC(1950) GROUPS = T / GROUPS DATA STRUCTURE PCOUNT = 5 / # PARAMETERS/GROUP GCOUNT = 631 / # DATA GROUPS BSCALE = 2.441406E-04 / REAL = TAPE*BSCALE + BZERO BZERO = 0.0 / NO BIAS ADDED BUNIT = 'JY ' / UNITS OF FLUX BLANK = -32768 / TAPE VALUE THAT => BLANK PIXEL OBJECT = '0742+103' / SOURCE NAME INSTRUME= 'VLA ' / NRAO(CV) VLA MAPPING PROGRAMS TELESCOP= 'VLA ' / NRAO(CV) VLA MAPPING PROGRAMS EPOCH = 1950.0 / EPOCH OF RA, DEC (YEARS) OBSERVER= 'BRID ' / ID CODE DATE-OBS= '05/01/80' / OBSERVATION START DATE DD/MM/YY DATE = '12/04/80' / TAPE WRITING DATE: DD/MM/YY ORIGIN = 'NRAO(CV) PGM=DUV2FITS(V1)' / HISTORY VLACV SORT ORDER='BH' / SECOND VARIES FASTER WHERE B MEANS ASCENDING BASELINE NUMBER WHERE H MEANS ASCENDING HOUR ANGLE CTYPE2 = 'COMPLEX ' / FRINGE VISIBITIES CRPIX2 = 1.0 / REF PIXEL CRVAL2 = 1.0 / REAL FIRST CDELT2 = 1.0 / THEN IMAGINARY CTYPE3 = 'STOKES ' / COORD TYPE: #=> I,Q,U,V CRPIX3 = 1.0 / REF PIXEL LOCATION CRVAL3 = 1.0 / REF PIXEL VALUE => I CDELT3 = 1.0 / VALUE INCREMENT CTYPE4 = 'FREQ ' / VALUE IS HZ CRPIX4 = 1.0 / REF PIXEL (ONLY ONE) CRVAL4 = 4.8851000E+09 / COORDINATE VALUE CDELT4 = 0.0 / ONLY ONE CTYPE5 = 'RA ' / COORD TYPE: IN DEGREES CRPIX5 = 1.0 / REF PIXEL LOCATION CRVAL5 = 115.7019375 / REF PIXEL VALUE CDELT5 = 0.0 / VALUE INCREMENT CTYPE6 = 'DEC ' / COORD TYPE: IN DEGREES CRPIX6 = 1.0 / REF PIXEL LOCATION CRVAL6 = 10.3090667 / REF PIXEL VALUE CDELT6 = 0.0 / VALUE INCREMENT PTYPE1 = 'BASELINE' / PAR TYPE: VALUE IS NUMBER PSCAL1 = 1.0 / NO MEANING TO SCALING PZERO1 = 0.0 / NO OFFSET EITHER PTYPE2 = 'HA ' / PAR TYPE: VALUE IS DEGREES PSCAL2 = 5.49316406E-03 / REAL = TAPE*PSCAL + PZERO PZERO2 = 0.0 / NO OFFSET PTYPE3 = 'UU ' / PAR TYPE: U VIS COORD IN SEC. PSCAL3 = 3.999997E-09 / REAL = TAPE*PSCAL + PZERO PZERO3 = 0.0 / NO BIAS ADDED PTYPE4 = 'VV ' / PAR TYPE: V VIS COORD IN SEC. PSCAL4 = 3.999997E-09 / REAL = TAPE*PSCAL + PZERO PZERO4 = 0.0 / NO BIAS ADDED PTYPE5 = 'WW ' / PAR TYPE: W VIS COORD IN SEC. PSCAL5 = 3.999997E-09 / REAL = TAPE*PSCAL + PZERO PZERO5 = 0.0 / NO BIAS ADDED COMMENT FORMULA FOR BASELINE # FROM ANTENNA PAIR I < J COMMENT B = (256 * I) + J COMMENT ANTENNA LOCATIONS IN NANOSECONDS: HISTORY VLACV ANT N= 2 X= 5470.525 Y=-14443.176 Z= -8061.210 ST='AW4' HISTORY VLACV ANT N= 4 X= 1667.280 Y= -4396.334 Z= -2452.399 ST='CW8' HISTORY VLACV ANT N= 5 X= 37.719 Y= 135.627 Z= -50.585 ST='DE2' HISTORY VLACV ANT N= 6 X= 3353.710 Y= -8816.123 Z= -4910.700 ST='BW6' HISTORY VLACV ANT N= 7 X= 118.761 Y= 445.786 Z= -170.397 ST='DE4' HISTORY VLACV ANT N= 9 X= 10924.708 Y=-28961.684 Z=-16194.042 ST='AW6' HISTORY VLACV ANT N=10 X= 73.382 Y= 271.952 Z= -103.200 ST='DE3' HISTORY VLACV ANT N=12 X= 8324.926 Y= 31661.636 Z=-12190.700 ST='AE6' HISTORY VLACV ANT N=14 X= 14206.476 Y=-37731.068 Z=-21114.612 ST='AW7' HISTORY VLACV ANT N=15 X= 17842.852 Y=-47447.285 Z=-26566.649 ST='AW8' HISTORY VLACV ANT N=16 X= 1548.048 Y= 5883.154 Z= -2264.541 ST='CE9' HISTORY VLACV ANT N=17 X= 509.527 Y= -1338.539 Z= -745.231 ST='DW8' HISTORY VLACV ANT N=18 X= 2552.452 Y= 9638.185 Z= -3698.873 ST='BE6' HISTORY VLACV ANT N=20 X= -100.221 Y= -15.904 Z= 152.474 ST='DW2' HISTORY VLACV ANT N=21 X= -812.570 Y= -126.899 Z= 1200.964 ST='DN8' HISTORY VLACV ANT N=22 X= 1021.275 Y= -2683.726 Z= -1494.627 ST='CW6' COMMENT FORMULA FOR BASELINE BETWEEN ANTENNA I AND J (I < J): COMMENT BASELINE(IJ) = LOCATION(I) - LOCATION(J) COMMENT FORMULAE FOR UU, VV, WW : COMMENT UU = BX * SIN(HA) + BY * COS(HA) COMMENT VV = BZ * COS(DEC) + SIN(DEC) * (BY * SIN(HA) - BX * COS(HA)) COMMENT WW = BZ * SIN(DEC) + COS(DEC) * (BX * COS(HA) - BY * SIN(HA)) WHERE UU AND VV ARE THEN ROTATED TO THE EPOCH GIVEN ABOVE END ^;sT(33 my3 L'0& w}(F/0H Y 3U^b*-As2 4l 0~  '. w G"0E0H %.=0:^` )s$x kO BJ w, k0H;E^8ڀlsW/X'ŀ) 8π>Nb <5 w u40Hf 7{u ^ 1 9/ s>!  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