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X(*,*).......X(I,K) is point I in curve K. X values must be in
***ASCENDING*** order if integration, averaging, or
differentiation of the input curves are requested.
Interpolation can be done for arbitrary curves in the
plane, including closed ones signalled by the first point
being the same as the last point. For histogram plots,
histogram bar I in curve K has width BWIDTH(K), center at
X(I,K), bottom at YBASE(K), and top at Y(I,K).