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CONCA

       SUBROUTINE  CONCA (Z1,ZE,Z2, MX,MY, NX,NY, NZ, PL2OR3)
 C$    (Contour Array)
 C$    Draw contours of  data stored in  an array.  Contour  lines
 C$    corresponding to  negative function  values will  be  drawn
 C$    with dashed lines,  and every fifth  contour will be  drawn
 C$    with a  heavy line  when the  plot device  can support  the
 C$    feature.  Contours  are  drawn  starting  at  Z  =  Z1  and
 C$    continuing in steps of DZ up to Z = Z2.  The arguments are:
 C$
 C$    (Z1,Z2)         Data range for the contouring.
 C$    (MX,MY)         Actual declared dimensions of ZE(*,*).
 C$    ZE(NX,NY)       Array containing data to be contoured.
 C$    NZ              Number of contours in the range (Z1,Z2),
 C$                    (NZ .GT. 1).
 C$    PL2OR3          2-D or 3-D pen movement subroutine, perhaps
 C$                    PL2CA or  PL3CA.   If 3-D  plotting  is  in
 C$                    effect (set via  CALL SET3D (.TRUE.)),  the
 C$                    3-D version  must be  used.  Otherwise  the
 C$                    2-D version is required.
 C$
 C$    (30-JAN-82)