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DEBUG

      <ON | OFF>
      <LIMIT nnn>

 Select plot debugging via CORE routine SETBUG.  If the options are  all
 omitted, DEBUG  ON  is  assumed.  The  LIMIT  parameter  specifies  the
 maximum number of debug  output lines permitted  until debug output  is
 next selected; a 0  value (the default)  allows unlimited output.   The
 FILE option can be used to direct the debug output to a file other than
 the default SLIDES print output file.

 Debug output is produced for every vector plotted, and for each  change
 in CORE viewing parameters.   It should be avoided  when text is  being
 drawn since this produces a very large number of vectors.