% @(#)subtraicat.hlq	19.1 (ESO-IPG) 02/25/03 14:03:47 
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%.COPYRIGHT  (c)  1990 European Southern Observatory
%.IDENT      subtraicat.hlq
%.AUTHOR     KB, IPG/ESO
%.KEYWORDS   MIDAS, help files, SUBTRACT/ICAT
%.PURPOSE    On-line help file for the command: SUBTRACT/ICAT
%.VERSION    1.0  03-SEP-1984 : Creation, KB
%.VERSION    1.1  20-JUN-1991 : Update, KB
%----------------------------------------------------------------
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SECTION./ICAT
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SUBTRACT/ICAT					20-JUN-1991  KB
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SUBTRACT/ICAT [cat_name] frame_list                
	remove entries from an image catalog
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Purpose:
          Remove entries from an image catalog.
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Syntax: 
          SUBTRACT/ICAT [cat_name] [frame_list]                
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          cat_name = name of image catalog;
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              if there is an image catalog enabled (cf. SET/ICAT), 
              'cat_name' is defaulted to this "active" image catalog
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          frame_list = list of frames to be subtracted,
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               maybe file specifications, separated by a comma (no spaces!);
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               or a single catalog name;
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               or wildcard specifications (e.g. a3*,n*.bdf);
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               or numbers referring to the names (e.g. \#7,\#1)
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Note:
          The different options for the frame_list may not be mixed!
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See also:
          SET/ICAT, CREATE/ICAT, CLEAR/ICAT, READ/ICAT, ADD/ICAT
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          Chapter 3 of the MIDAS Users Guide, Volume A
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Examples:
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          SUBTRACT/ICAT dec88 galax001
          Remove the entry for image frame galax001.bdf from catalog dec88.cat
\xe\ex
          SUBT/ICAT dec88 gal*
          Remove entries for all image frames where the names begin with the
          string "gal" from catalog dec88.cat.
\xe\ex
          SUBT/ICAT dec88 nov89.cat
          Remove entries for all frames which are in the image catalog 
          nov89.cat from catalog dec88.cat.
\xe\ex
          SUBT/ICAT dec88 \#1,\#6
          Remove entries no. 1 and no. 6 from catalog dec88.cat.
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