Blurb::
Integer abscissas for a point histogram
Description::
A list of integer abscissa ("x" coordinate) values characterizing the
probability density function for each of the integer
``histogram_point_uncertain`` variables.  These must be listed in
increasing order for each variable, and are paired with
:dakkw:`variables-histogram_point_uncertain-integer-counts`.  See
:dakkw:`variables-histogram_point_uncertain` for details and examples.
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