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PLTMA

       SUBROUTINE  PLTMA (X,Y,X0,Y0)
 C$    (Margin Adjuster)
 C$    PLTMA  adjusts  the  unit  square  coordinates  (X0,Y0)  to
 C$    provide a hyperbolic tangential distortion of (X,Y) of  the
 C$    outer 10 per cent of the unit square, so the pen will never
 C$    run over the edge  of the page, and  at the same time,  all
 C$    pen movements will be  recorded.  This is sometimes  useful
 C$    in debugging, or for displaying part of the graph with  the
 C$    remainder squashed into the margin.
 C$    (13-AUG-80)