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CONXS

       SUBROUTINE  CONXS (Z1,ZE,Z2, MX,MY, NX,NY, NZ, NUY, PL2)
 C$    (Shade Alternate Contours in X Direction)
 C$    This routine produces  a contour plot  in which shading  is
 C$    drawn  between  alternate  pairs  of  contour  lines.    By
 C$    appropriate choices of color  or density of shading,  quite
 C$    pleasing results may  be obtained.   Shaded contours  often
 C$    prove suitable for use in transparencies to be shown before
 C$    an audience because of the increased visibility compared to
 C$    ordinary contour lines.  The arguments are:
 C$
 C$    (MX,MY)     Actual declared dimensions of Z(*,*)
 C$    ZE(NX,NY)   Data array
 C$    (Z1,Z2)     Interval to be marked
 C$    NZ          Number of contours (.GE. 2)
 C$    NUY         Number of shading strokes in Y direction
 C$    PL2         2-D pen movement subroutine, perhaps PL2CA
 C$
 C$    (30-JAN-82)