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Linear interpolation for grid to world mapping using singly
dimensioned coord arrays.
This routine can be used both for
See also the Section called Contour Plots from C in Chapter 3 and
the Section called Shade Plots from C in Chapter 3.
This function is currently available in C, C++, Ocaml, Perl, Python and Tcl.
This function is used in examples 9 and 16.