XTENSION= 'BINTABLE' / Binary table extension BITPIX = 8 / number of bits per data pixel NAXIS = 2 / always 2 for a FITS table NAXIS1 = xxx / number of chars needed to describe columns NAXIS2 = yyy / number of rows of WCSs stored in the table PCOUNT = 0 / required FITS extension keyword GCOUNT = 1 / required FITS extension keyword TFIELDS = nn / Number of columns in the table EXTNAME = 'DEI_WCS' / This table describes a group DATE = 'dd/mm/yy' / Date of construction of grouping table CTIME = 'WkD CcYy Mon Dt Hr:Mn:Ss TZn' / Time of construction of table COMMENT This document does not attempt to describe any particular COMMENT ordering for these columns. In real applications the columns COMMENT need not be in any particular order. COMMENT Note that on architectures with alignment requirements it will be COMMENT much more efficient if NAXIS1 is a multiple of the word size. COMMENT Thus it is probably wise to add extra columns as necessary such COMMENT that NAXIS1 is a multiple of 8. COMMENT Ordering of the columns within each row should be chosen with COMMENT the same constraint in mind. TFORMn = '8A' / size and type of column data TTYPEn = 'CCDPOS' / In which position was this CCD? TFORMn = '8A' / size and type of column data TTYPEn = 'AMPPOS' / In which position is this amplifier? TFORMn = '16A' / size and type of column data TTYPEn = 'CTYPE' / WCS keyword array TDIMn = '(8,2)' / Dimension of array TFORMn = '2E' / size and type of column data TTYPEn = 'CRPIX' / WCS keyword TDIMn = '(2)' / Dimension of array TDISPn = 'F10.3' / Fortran 90 format for display TFORMn = '2E' / size and type of column data TTYPEn = 'CRVAL' / WCS keyword TDIMn = '(2)' / Dimension of array TFORMn = '2E' / size and type of column data TTYPEn = 'CDELT' / WCS keyword TDIMn = '(2)' / Dimension of array TFORMn = '4E' / size and type of column data TTYPEn = 'PC' / WCS keyword TDIMn = '(2,2)' / Dimension of array TFORMn = '16A' / size and type of column data TTYPEn = 'CUNIT' / WCS keyword TDIMn = '(8,2)' / Dimension of array TFORMn = '8A' / size and type of column data TTYPEn = 'RADECSYS' / WCS keyword TFORMn = '8A' / size and type of column data TTYPEn = 'EQUINOX' / WCS keyword TDISPn = 'F13.6' / Fortran 90 format for display TFORMn = 'D' / size and type of column data TTYPEn = 'MJD_WCS' / UCO/Lick keyword TDISPn = 'F17.9' / Fortran 90 format for display TFORMn = '8A' / size and type of column data TTYPEn = 'DOMAIN' / DEI_WCS keyword TFORMn = 'nE' / size and type of column data TTYPEn = 'PROJP' / WCS keyword array COMMENT It is not clear that we will need the PROJPn WCS keywords. COMMENT It is not clear how to denote the possibility of zero-based COMMENT index in PROJP0, or what the highest-numbered index is. ENDThe header is padded with ASCII blanks such that it consists of a positive integer multiple of 2880 bytes (36 card images of 80 characters).
The semantics of the keywords/columns which are not derived from the draft WCS standard document are described in this data dictionary.