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CONSX

       SUBROUTINE  CONSX (Z1,ZE,Z2, MX,MY, NX,NY, NUY, PL2)
 C$    (X-Shading)
 C$    Mark off the  region of a  plane in which  an array  stored
 C$    function lies within a selected interval.  Horizontal lines
 C$    are drawn whose position  corresponds to the array  points,
 C$    and whose  extent is  determined by  linear  interpolation.
 C$    With a plot  step size  of 0.01  inch, there  are 650  plot
 C$    steps in the  Y direction  in a standard  plot frame.   The
 C$    arguments are:
 C$
 C$    (MX,MY)     Actual declared dimensions of ZE(*,*)
 C$    ZE(NX,NY)   Data array
 C$    (Z1,Z2)     Interval to be marked
 C$    NUY         Number of shading strokes in Y direction
 C$    PL2         2-D pen movement subroutine, perhaps PL2CA
 C$
 C$    (30-JAN-82)