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DEM51

       SUBROUTINE  DEM51 (NIN,NOUT)
 C$    (DEM51 - Flow Vectors)
 C$    Demonstrate the graphing of a vector field with PLTFV.  The
 C$    illustrated field arises  from van  der Pol's  differential
 C$    equations:
 C$
 C$    dx/dt = y
 C$
 C$    dy/dt = mu*(1 - x**2)*y - x
 C$
 C$    where mu is a constant in the range 0.1..10.0.  With  (x,y)
 C$    representing the  coordinate of  a point  on a  rectangular
 C$    grid, (dx/dt,dy/dt)  represents the  vector field  at  that
 C$    point.
 C$    (10-APR-82)