Blurb::
Number of pairs defining each histogram point real variable

Description::
By default, the list of \c abscissas and \c counts will be evenly
divided among the histogram point real variables.  The number of \c
pairs_per_variable specifies the apportionment of abscissa/count pairs
among the histogram point real variables.  It must specify one
integer >=1 per variable that indicates how many of the (abscissa,
count) = (x,c) pairs to associate with that variable.

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