Blurb::
Real abscissas for a bin histogram

Description::
A list of real abscissa ("x" coordinate) values characterizing the
probability density function for each of the \c
histogram_bin_uncertain variables.  These are paired with either 
\ref variables-histogram_bin_uncertain-counts or 
\ref variables-histogram_bin_uncertain-ordinates.  See 
\ref variables-histogram_bin_uncertain for details and examples.

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