SXWRITE

       Write a group of data and parameters in ST format
       to a STSDAS data file.

       SXWRITE, Unit, Data,[ Par]

       Unit = unit number of file.  The file must have been
               previously opened by SXOPEN.
       Data = Array of data to be written.  The dimensions
               must agree with those supplied to SXOPEN and written
               into the FITS header.  The type is converted if
               necessary.

       Par = parameter block.  The size of this array must
               agree with the Psize parameter in the FITS header.

       None.

       STCOMMN - Contains RESULT(20,10) where RESULT(i,LUN) =
       0 - 121147 for consistency check, 1 - Unit for consistency,
       2 - bitpix, 3 - naxis, 4 - groups (0 or 1), 5 - pcount,
       6 - gcount, 7 - psize, 8 - data type as idl type code,
       9 - bytes / record, 10 to 10+N-1 - dimension N,
       18 - # of groups written, 19 = gcount.

       The data are written into the next group.

       SXOPEN must have been called to initialize the
       header and the common block.

       DMS, July, 1983.
       D.Lindler July, 1986 - changed block size of file to 512
                       moved group parameters after the groups data.
       D.Lindler July, 1987 - modified to allow any size parameter block
                       (in bytes).
       D. Lindler  April, 1990 - converted to new VMS IDL
       Converted to IDL V5.0   W. Landsman   September 1997

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