SXDELPAR

       Procedure to delete a keyword parameter(s) from a FITS header

       sxdelpar, h, parname

       h - FITS or STSDAS header, string array
       parname - string or string array of keyword name(s) to delete

       h - updated FITS header, If all lines are deleted from
               the header, then h is returned with a value of 0

       Delete the astrometry keywords CDn_n from a FITS header, h
       IDL> sxdelpar, h, ['CD1_1','CD1_2','CD2_1','CD2_2']

       (1)  No message is returned if the keyword to be deleted is not found
       (2)  All appearances of a keyword in the header will be deleted

       version 1  D. Lindler Feb. 1987
       Converted to new IDL  April 1990 by D. Lindler
       Test for case where all keywords are deleted    W. Landsman Aug 1995
       Converted to IDL V5.0   W. Landsman   September 1997
       Allow for headers with more than 32767 lines W. Landsman Jan. 2003

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