FXBINTABLE

       Common block FXBINTABLE used by "FXB" routines.

       This is not an IDL routine as such, but contains the definition of the
       common block FXBINTABLE for inclusion into other routines.  By defining
       the common block in one place, the problem of conflicting definitions
       is avoided.
       This file is included into routines that need this common block with
       the single line (left justified)
                                 @fxbintable
       FXBINTABLE contains the following arrays:
               LUN     = An array of logical unit numbers of currently (or
                         previously) opened binary table files.
               STATE   = Array containing the state of the FITS files
                         associated with the logical unit numbers, where
                         0=closed, 1=open for read, and 2=open for write.
               HEAD    = FITS binary table headers.
               MHEADER = Array containing the positions of the first data byte
                         of the header for each file referenced by array LUN.
               NHEADER = Array containing the positions of the first data byte
                         after the header for each file referenced by array
                         LUN.
               NAXIS1  = Values of NAXIS1 from the binary table headers.
               NAXIS2  = Values of NAXIS2 from the binary table headers.
               TFIELDS = Values of TFIELDS from the binary table headers.
               HEAP    = The start of the first byte of the heap area
                         for variable length arrays.
               DHEAP   = The start of the first byte of the next variable
                         length array, if writing.
               BYTOFF  = Byte offset from the beginning of the row for each
                         column in the binary table headers.
               TTYPE   = Values of TTYPE for each column in the binary table
                         headers.
               FORMAT  = Character code formats of the various columns.
               IDLTYPE = IDL type code for each column in the binary table
                         headers.
               N_ELEM  = Number of elements for each column in the binary
                         table headers.
               TSCAL   = Scale factors for the individual columns.
               TZERO   = Zero offsets for the individual columns.
               MAXVAL  = For variable length arrays, contains the maximum
                         number of elements for each column in the binary
                         table headers.
               N_DIMS  = Number of dimensions, and array of dimensions for
                         each column of type string in the binary table
                         headers.

       Data Handling, I/O, FITS, Generic.

       William Thompson, Feb 1992.

       William Thompson, GSFC, February 1992.

       Version 1, William Thompson, GSFC, 12 April 1993.
               Incorporated into CDS library.
       Version 2, William Thompson, GSFC, 21 July 1993.
               Added DHEAP variable to fix bug with variable length arrays.

       Version 2, 21 July 1993.

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