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KZ...........Number of sets of Z values. If not supplied, KZ will be
set to the index of the last curve for which a value has
been set in Z(1,KZ). If KX .NE. KZ, the last set of X or
Z values will be assumed to apply to the remaining ones.
Thus, if there are 3 sets of Z values, each having the
same X values, set KZ=3 and KX=1, so that the X values
need not be input three times. If entries beyond the
KZ-th position are found in ZSHIFT(*) or ZFACT(*), and KZ
is being determined automatically, then the KZ-th set of Z
values will be automatically copied into succeeding sets
and KZ incremented accordingly.