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Up: APPENDIX: Data Exchange Proposal
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Finally we show an example of a binary table header with 6 columns of number of different data types and dimensions. Columns labeled POS, VEL, and ACC are arrays of dimension 1 and length NDIM. The column labeled CODE is a character string of length 4. The nonstandard keywords TIME, COORDSYS, etc. also appear at the end of the header, and identify global parameters of the dataset. Although copied by any FITS reading program, their meaning is only understood in the context of an `` NBODY BINTABLE''. Note the units are not SI, which is what the IAU recommends to store data in FITS format. The (binary) data followed at a multiple of 2880 bytes after the last keyword of the header (always END) is not displayed.
NOTE: The first two lines of numbers are only present to show card columns and are not part of the table header.
1 2 3 4 5 6 7 8 12345678901234567890123456789012345678901234567890123456789012345678901234567890 XTENSION= 'BINTABLE' / Extension type BITPIX = 8 / Binary data NAXIS = 2 / Table is a matrix NAXIS1 = 76 / Width of table row in bytes NAXIS2 = 1024 / Number of rows in table (number of Nbodies) PCOUNT = 0 / Random parameter count GCOUNT = 1 / Group count TFIELDS = 6 / Number of columns in each row EXTNAME = 'NBODY ' / Standardized name of this extension EXTVER = 1 / Version number of table TFORM1 = '1D ' / Double Precision value in col 1 TTYPE1 = 'MASS ' / Type (label) of column 1 TUNIT1 = 'SOLARM ' / Physical units of column 1 TFORM2 = '3D ' / Array of NDIM Double Precision values in col 2 TTYPE2 = 'POS ' / Type (label) of column 2 TUNIT2 = 'KPC ' / Physical units of column 2 TFORM3 = '3D ' / Array of NDIM Double Precision values in col 3 TTYPE3 = 'VEL ' / Type (label) of column 3 TUNIT3 = 'KM/S ' / Physical units of column 3 TFORM4 = '1F ' / Floating point number in col 3 TTYPE4 = 'PHI ' / Type (label) of column 4 TUNIT4 = 'KM**2/S**2' / Physical units of column 4 TFORM5 = '3F ' / Array of NDIM Floating point values in col 5 TTYPE5 = 'ACC ' / Type (label) of column 5 TUNIT5 = 'KM**2/S**2/KPC' / Physical units of column 5 TFORM6 = '4A ' / Character string (4) in col 6 TTYPE6 = 'CODE ' / Type (label) of column 6 COMMENT Now follow some 'global' parameters to this dataset TIME = 10.0 / Model time of this snapshot COORDSYS= 'CARTESIAN' / Coordinate system NDIM = 3 / Number of dimensions AUTHOR = 'Teuben' / Person who is responsible for the data ORIGIN = 'NEMO' / Originator DATE = '05/12/93' / dd/mm/yy when file created DATEOBS = '28/08/93' / dd/mm/yy when simulation done HISTORY NEMO mkplummer out=run301.in nbody=1024 massexpr=pow(m,p) HISTORY NEMO masspars=p,-2.0 massrange=0.1,10 VERSION=2.5a HISTORY NEMO nbody0 in=run301.in out=run301.out eta=0.01 tcrit=20 HISTORY NEMO eps=0.025 VERSION=1.2b HISTORY NEMO snaptrim run301.out tmp3421 times=10 VERSION=1.5a HISTORY NEMO snapfits tmp3421 run301.t20.fits END