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DEM89

       SUBROUTINE  DEM89 (NIN,NOUT)
 C$    (DEM89 - Double Surface versus 3-D PolyLine)
 C$    Demonstration for the graphing of a pair of surfaces,  made
 C$    up out of planes and cones.
 C$
 C$    This is a variation  of DEM09, and illustrates 3-D polyline
 C$    graphing with PLNDO in  a side-by-side view.   PLNDO can be
 C$    used to superimpose  3-D space curves  on  a double-surface
 C$    hidden-line  plot produced by HIDDO.   The curves are drawn
 C$    independently of the  surface plotting  that  maintains the
 C$    near  and  far    horizons   necessary  for    hidden  line
 C$    elimination, so all segments will be visible.
 C$
 C$    An unclosed box  is shown on the  PLNDO plot; the  vertical
 C$    line marks the  Z  axis extending from  the  origin  in the
 C$    lower left corner.
 C$    (13-JUL-89)