In this example the image is given as a list of the energy and pixel coordinates of a set of detected photons. A 2-D image array could be generated from this list by making a 2-D histogram of the number of photons that were recorded in each pixel. The TLMINn and TLMAXn keywords shown below are not required, but are useful for recording the legal range of the values in each column and are used when constructing histograms of the values.
XTENSION= 'BINTABLE' / binary table extension BITPIX = 8 / 8-bit bytes NAXIS = 2 / 2-dimensional binary table NAXIS1 = 8 / width of table in bytes NAXIS2 = 10000 / number of rows in table PCOUNT = 0 / size of special data area GCOUNT = 1 / one data group (required keyword) TFIELDS = 3 / number of fields in each row TTYPE1 = 'ENERGY ' / energy of the photon TFORM1 = '1E ' / data format of the field: R*8 TTYPE2 = 'X ' / X pixel coordinate of the photon TFORM2 = '1I ' / data format of the field: ASCII Character TTYPE3 = 'Y ' / Y pixel coordinate of the photon TFORM3 = '1I ' / data format of the field: ASCII Character TCTYP2 = 'RA---TAN' / TAN projection used TCRPX2 = 150 / reference pixel TCRVL2 = 45.83 / reference pixel TCDLT2 = -.00277777 / increment per pixel TCUNI2 = 'deg ' / physical units of axis 1 TLMIN2 = 1 / lower limit of axis 1 TLMAX2 = 300 / upper limit of axis 1 TCTYP3 = 'DEC--TAN' / TAN projection used TCRPX3 = 100 / reference pixel TCRVL3 = 63.57 / reference pixel TCDLT3 = .00277777 / increment per pixel TCUNI3 = 'deg ' / physical units of axis 2 TCROT3 = 30.0 / image rotation (degrees) TLMIN3 = 1 / lower limit of axis 2 TLMAX3 = 200 / upper limit of axis 2 TPC0202 = .866025403 / Coord. Descrp. Matrix: cos(TCROT2) TPC0303 = -.5 / Coord. Descrp. Matrix: -sin(TCROT2) TPC0203 = .5 / Coord. Descrp. Matrix: sin(TCROT2) TPC0302 = .866025403 / Coord. Descrp. Matrix: cos(TCROT2) EQUINOX = 2000.0 / coordinate epoch MJD-OBS = 44258.7845612 / MJD of the observation END