SXREAD

       Read a Space Telescope STSDAS image file

       result = sxread( Unit, group , [par] )

       UNIT  =  Unit number of file, must be from 1 to 9.
               Unit must have been opened with SXOPEN.
       GROUP  =  group number to read.  if omitted, read first record.
               The first record is number 0.

       Result of function  =  array constructed from designated record.

       PAR  =  Variable name into which parameter values from STSDAS
               group parameter block are read.  It is a byte array
               which may contain multiple data types.  The function
               SXGPAR can be used to retrieve values from it.

       Uses IDL Common STCOMMN to access parameters.

       Use the function SXGREAD to read the group parameter blocks without
       having to read the group array.
       If the STSDAS file does not contain groups, then the optional output
       parameter PAR is returned undefined, but no error message is given.

       IO is performed.

       WRITTEN, Don Lindler, July, 1 1987
       Converted to IDL V5.0   W. Landsman   September 1997

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