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DEM19

       SUBROUTINE  DEM19 (NIN,NOUT)
 C$    (DEM19 - Tetrahedral Wave Functions)
 C$    Demonstration to exercise  the programs  HIDSV, VISSS,  and
 C$    others which might use  spherical polar coordinates.   This
 C$    includes hidden surface, contouring and shading options, as
 C$    well  as  several   multicolor  techniques.   The   surface
 C$    employed  is   a  rather   simple  approximation   to   the
 C$    tetrahedral bonding functions, and  therefore is one  which
 C$    has  large  lobes  in  the  tetrahedral  directions.    The
 C$    variable L selects one of the options:
 C$
 C$    L=1   ordinary perspective and contours
 C$    L=2   checkerboard of latitude and longitude
 C$    L=3   contour bands
 C$    (10-OCT-84)