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UTRBA

       SUBROUTINE  UTRBA (ZE, MX,MY, NX,NY, BVALUE)
 C$    (Border Array)
 C$    It is sometimes convenient for hidden-line drawings to form
 C$    "curtains" around the border of  the figure by setting  the
 C$    function values on  the edge to  a constant value  somewhat
 C$    below the  average surface  level.  This  routine does  the
 C$    required filling of the surface array.  The arguments are:
 C$
 C$    ZE(NX,NY)......Array of function values.
 C$    (MX,MY)........Actual declared dimensions of ZE(*,*).
 C$    BVALUE.........Border value to be placed along the edges of
 C$                   ZE(*,*).
 C$    (09-APR-82)