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DEM66

       SUBROUTINE  DEM66 (NIN,NOUT)
 C$    (DEM66 - Combined 3-D Contour and Hidden-Line View)
 C$    This routine illustrates  the production  of a  hidden-line
 C$    view inside a box, on  the faces of which are  superimposed
 C$    contour plots of the function.  3-D contour lines are  also
 C$    superimposed on  the  hidden-line  drawing  without  hiding
 C$    segments which should be out of sight.  3-D axis  labelling
 C$    is also shown.
 C$    (14-FEB-81)