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PLTBO

       SUBROUTINE  PLTBO
 C$    (Border)
 C$    Set up a standard paper size page frame with an inner frame
 C$    one inch (25.4mm) inside of  it, and reset the unit  square
 C$    to correspond  to  the inner  frame.   The inner  frame  is
 C$    usually desirable  for  contour plots,  since  it  prevents
 C$    contour lines from appearing to  be "hanging in air".   The
 C$    unit square will be scaled to fit in this rectangular inner
 C$    frame.  If uniform scaling of  X and Y is important,  PLTSQ
 C$    should be used instead to establish a square viewport.
 C$    (07-JUN-85)