Blurb::
Real abscissas for a point histogram

Description::
A list of real abscissa ("x" coordinate) values characterizing the
probability density function for each of the real \c
histogram_point_uncertain variables.  These must be listed in
increasing order for each variable, and are paired with 
\ref variables-histogram_point_uncertain-real-counts.  See 
\ref variables-histogram_point_uncertain for details and examples.

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