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DEM12

       SUBROUTINE  DEM12 (NIN,NOUT)
 C$    (DEM12 - Rotated Surface)
 C$    Demonstration for HIDRV which  gives a rotated  perspective
 C$    view of  a function  stored in  a rectangular  array.   The
 C$    demonstration superposes  an ellipsoidal  and a  hyperbolic
 C$    mound, both on top of a saddle.
 C$    (20-JUL-89)