** Combination SURF/CONTOUR plot. **

** SURFC(...) is the same as SURF (...) except that a contour plot **

** is drawn beneath the surface. **

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** Because CONTOUR 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. **

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** See also SURF . **

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