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HIDBV

       SUBROUTINE  HIDBV (Z1,ZE,Z2, MX,MY, NX,NY, PL2)
 C$    (Birdseye View)
 C$    This routine produces an overhead ("Bird's Eye") view of  a
 C$    surface.  This  is  a  view of  the  surface  mesh  without
 C$    hidden-line removal.   It  is therefore  useful  for  quick
 C$    views of a surface before a more time-consuming hidden-line
 C$    view is made.  The arguments are:
 C$
 C$    (MX,MY)........Actual declared dimensions of ZE(*,*).
 C$    ZE(NX,NY)......Array of function values.
 C$    (Z1,Z2)........Range of function values.
 C$    PL2............2-D pen movement subroutine, normally PL2CA.
 C$
 C$    (19-MAR-83)