EXTGRP

       Extract the group parameter information out of SXREAD output

       This procedure extracts the group parameter information out of a
       header and parameter variable obtained from SXREAD.  This allows
       astrometry, photometry and other parameters to be easily SXPARed by
       conventional methods and allows the image and header to be saved in
       a SIMPLE format.

       ExtGrp, hdr, par

       HDR - The header which is to be converted (input and output)
       PAR - The Parameter string returned from a call to SXREAD

       HDR -  The converted header, string array

       SXPAR(), SXADDPAR, SXGPAR(), STRN()

       25-JUN-90 Version 1 written
       13-JUL-92 Header finally added to this ancient procedure, code spiffed up
       a bit.  Now 3 times faster.  Added PTYPE comment inclusion.  E. Deutsch
       Converted to IDL V5.0   W. Landsman   September 1997

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