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KX...........Number of sets of X values. If not supplied, KX will be
set to the index of the last curve for which a value has
been set in X(1,KX). If entries beyond the KX-th position
are found in XSHIFT(*) or XFACT(*), and KX is being
determined automatically, then the KX-th set of X values
will be automatically copied into succeeding sets and KX
incremented accordingly. For example, one may wish to
plot several sets histogram bars scaled or shifted about a
common set of X values; by not specifying KX, only one set
of X values need be provided.