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    Selects virtual pen N and defines its attributes  in  terms  of  colour,
    dashed  pattern  and  weight  (thickness).  Up to 16 pens can be defined
    (0-15). Most plotting commands use the current pen. The major  exception
    is  RGMAP  (iso-contouring)  which  uses the pen 0 (solid and foreground
    color by default) and 15 (dotted and blue by default). Some commands al-
    so ignore the dashed patterns, in particular all labels and the BOX com-
      - The dashed pattern D must be in range 1 to 8, 1 means solid lines.
      - The weight factor W must be a weight number or value.  See  subtopic
        /WEIGHT for details.
      - The  colour  index C is a color number or name. See subtopic /COLOUR
        for details.
    PENCIL N /DEFAULT reset default attributes to Pen number N.  PENCIL /DE-
    FAULT  reset default attributes for all Pens, as defined at program ini-


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