SXGREAD

       Read group parameters from a Space Telescope STSDAS image file

       grouppar = sxgread( unit, group )

       UNIT   = Supply same unit as used in SXOPEN.
       GROUP  =  group number to read.  if omitted, read first group.
               The first group is number 0.

       GROUPPAR  =  parameter values from fits group parameter block.
               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.

       IO is performed.

       WRITTEN, Don Lindler, July, 1 1987
       MODIFIED, Don Neill, Jan 11, 1991 - derived from sxread.pro
       Converted to IDL V5.0   W. Landsman   September 1997

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