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PLTHB

       SUBROUTINE  PLTHB (WHERE)
 C$    (Half Frame with Border)
 C$    Establish  a   half-frame  viewport,   assuming  either   a
 C$    horizontal  or  vertical  standard  paper  size  frame  has
 C$    already been defined.  The desired viewport is selected  by
 C$    the Hollerith string  argument, WHERE =  "LEFT" or  "RIGHT"
 C$    for a horizontal frame, or WHERE = "TOP" or "BOTTOM" for  a
 C$    vertical frame.  Only the first letter is significant,  and
 C$    it may be either upper case or lower case.  The viewport is
 C$    a rectangular  vertical  frame region  for  the  horizontal
 C$    format, and a  horizontal region for  the vertical  format.
 C$    Consequently, the scaling in X  and Y is different.  A  box
 C$    is drawn around the selected viewport.
 C$    (07-JUN-85)