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PLTVF

       SUBROUTINE  PLTVF
 C$    (Vertical Frame)
 C$    Set up a standard paper  size vertical frame with an  inner
 C$    frame  inside  of  it,  then  reset  the  unit  square   to
 C$    correspond to the vertical  frame inside the outer  border.
 C$    Subsequent use of the pen movement routines, PL2CA,  PL2SP,
 C$    etc.  will  result  in  a plot  correctly  aligned  on  the
 C$    vertical surface.
 C$
 C$    The unit square will be  scaled to fit in this  rectangular
 C$    inner frame, and no inner border is drawn, so this  routine
 C$    will often be selected for hidden-line drawings, where  the
 C$    different scaling of X and Y is not important.
 C$    (07-JUN-85)