STRD

       Open an STSDAS file and read into an image array and header.

       Combines the functions of SXREAD and SXOPEN.

       STRD, im, hdr, [ filename, GROUP = , PAR = ]

       FILENAME -  Character string giving the name of the SDAS file
               to be read.  If omitted, then program will prompt
               for the file name.  If an extension is given, then
               it must terminate in a 'h'.
               A default extension of '.hhh' is assumed, if one is
               not supplied.  Under VMS, the version numbers are ignored,
               and the most recent version is always used.

       IM - array containing image data
       HDR - string array containing header

       GROUP - scalar integer specifying group number to read.  Default is 0.

       PAR - Parameter block (byte array) read from group formatted data

       STCOMMN - Created by SXOPEN.  STRD uses STCOMMN to check
               for an open unit, and to get image dimensions.

       STSDAS image array and header are read into IM and HDR
       IF FILENAME is not supplied, then the program will check that
       the image and header variable do not already contain data.

       Set !QUIET = 1 to suppress informational messages.

       Program checks that specified STSDAS file exists before calling
       SXOPEN and SXREAD to read in data.

       FDECOMP, PICKFILE(), SPEC_DIR(), SXOPEN, SXREAD()

       Written W. Landsman, STI Corporation August 1986
       Optional parameter "FILENAME" added November 1986
       Correctly print header size when more than 2 dimensions February 1996
       Add GROUP, PAR keywords, call PICKFILE   W. Landsman   March 1996
       Converted to IDL V5.0   W. Landsman   September 1997

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