GU -- Graphics utility
   GU COLORS
   GU DEL name
   GU LIST string
   GU MAKE level color bframe eframe
   GU MAKE level blue green red bframe eframe
   GU OFF level bframe eframe
   GU ON level bframe eframe
   GU REST name bframe eframe
   GU SAVE name frame
   GU TABLE name
Parameters:
   COLORS | lists the predefined colors in the MCRGB.TXT data file
   DEL | deletes a graphics file
   LIST | lists the saved graphics files
   MAKE | sets the graphics levels
   OFF | turns the graphics level off
   ON | turns the graphics level on
   REST | restores a saved graphics file to the current table, then lists
          the values (def)
   SAVE | saves the current graphics table to a file
   TABLE | lists the values in a graphics file
   level | graphics color level (def=all levels for OFF and ON options,
           no default for MAKE option
   color | predefined color; use GU COLORS to list the valid colors
   bframe/eframe | frame range (bframe def=current, eframe def=bframe)
   red/green/blue | color gun intensity; range is 0-255 (def=0)
   name | graphics file name, 8 characters maximum; do not specify
          extension, e.g., .GRX (def=default table for REST option;
          def=current for TABLE option; no def for DEL and SAVE options)
   string | list only the graphics files beginning with this character
            string (no default; list all graphic files)
   frame | graphics frame number (def=current)
Remark:
   The default file extension for the LIST, REST, SAVE, and TABLE
   options is .GRX.
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