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DEM31

       SUBROUTINE  DEM31 (NIN,NOUT)
 C$    (DEM31 - Complex Surface)
 C$    Demonstration for  the representation  of a  function of  a
 C$    complex variable.  The modulus of the function can be shown
 C$    as a surface in three dimensions, but the phase is lost  in
 C$    the process.   By showing  contours of  constant phase  the
 C$    lost information  is  regained,  but it  is  hard  to  show
 C$    contours on a surface  already densely populated by  linear
 C$    arcs.  By showing regions  of different phase in  different
 C$    colors  the   information  is   presented  in   a   readily
 C$    perceivable form.
 C$    (10-APR-82)