Combination MESH/CONTOUR plot.

  MESHC(...) is the same as MESH2O6LFXR(...) except that a contour plot

  is drawn beneath the mesh.



  Because CONTOURXAOYTS does not handle irregularly spaced data, this 

  routine only works for surfaces defined on a rectangular grid.

  The matrices or vectors X and Y define the axis limits only.



  See also MESH2O6LFXR.