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DEM23

       SUBROUTINE  DEM23 (NIN,NOUT)
 C$    (DEM23 - Spherical View)
 C$    Calculation of the tilt of  the elementary rectangles as  a
 C$    function of THETA and PHI for use in choosing the  diagonal
 C$    sequence to be followed in the spherical sequence routines.
 C$    (09-MAR-89)