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PLTVB

       SUBROUTINE  PLTVB
 C$    (Vertical Border)
 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 inner  frame is  usually desirable  for contour  plots,
 C$    since it  prevents  contour  lines  from  appearing  to  be
 C$    "hanging in air".  The unit square will be scaled to fit in
 C$    this rectangular inner frame.  If uniform scaling of X  and
 C$    Y is important, PLTSQ should be used instead to establish a
 C$    square viewport.
 C$    (07-JUN-85)