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These functions calculate default values for chart elements without actually
displaying the chart.  The functions ending with ms analyze multi-series
charts; the others analyze single-series charts.

The following functions are defined:

_pg_analyzechart
    analyze a bar, column or line chart

_pg_analyzechartms
    analyze a multi-series bar, column or line chart

_pg_analyzepie
    analyze a pie chart

_pg_analyzescatter
    analyze a scatter chart

_pg_analyzescatterms
    analyze a multi-series scatter chart