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
``histogram_bin_uncertain`` variables.  These are paired with either
:dakkw:`variables-histogram_bin_uncertain-counts` or
:dakkw:`variables-histogram_bin_uncertain-ordinates`.  See
:dakkw:`variables-histogram_bin_uncertain` for details and examples.
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