XTENSION= 'BINTABLE' / binary table extension BITPIX = 8 / 8-bit bytes NAXIS = 2 / 2-dimensional binary table NAXIS1 = 8 / width of table in bytes NAXIS2 = 256 / number of rows in table PCOUNT = 0 / size of special data area GCOUNT = 1 / one data group (required keyword) TFIELDS = 2 / number of fields in each row TTYPE1 = 'Ind_Pointer' / label for field 1 TFORM1 = '1J ' / data format of field: 4-byte INTEGER TTYPE2 = 'Ind_Length' / label for field 2 TFORM2 = '1J ' / data format of field: 4-byte INTEGER EXTNAME = 'Spatial_Index' / this is a spatial index of a FITS table INDTABLE= `myfile.fits:BINTABLE:EVENTS:1' / name of the indexed table IAXIS = 2 / dimensionality of the index ITYPE1 = 'X ' / first index column name IAXIS1 = 16 / number of bins in this axis of the index ISTRT1 = 1. / beginning value of first index bin IDELT1 = 32. / width of the index bin ITYPE2 = 'Y ' / 2nd index column name IAXIS2 = 16 / number of bins in this axis of the index ISTRT2 = 1. / beginning value of 2nd index bin IDELT2 = 32. / width of the index bin FORELINK= 'Next_Pointer' / name of the column containing forward link END
The table contains 16 x 16 = 256 rows and 2 columns:
IND_POINTER IND_LENGTH ----------- ---------- 412 320 65 505 . .