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     The routines in the _pg_analyzescatter family analyze a single or
     multiple series of data without actually displaying the graphic
     image.
 
     The _pg_analyzescatter function fills the chart environment for a
     single-series scatter diagram. The variables calculated by
     _pg_analyzescatter reflect the data given in the <xvalues> and
     <yvalues> arguments. All arguments are identical to those for the
     _pg_chartscatter function.
 
     The _pg_analyzescatterms function fills the chart environment for
     a multiseries scatter diagram. The variables calculated by
     _pg_analyzescatterms reflect the data given in the <xvalues> and
     <yvalues> arguments. All arguments are identical to those for the
     _pg_chartscatterms function.
 
     Boolean flags in the chart environment, such as AUTOSCALE and
     LEGEND, should be set to TRUE before calling _pg_analyzescatterms
     so that the function will calculate all defaults.
 
     Return Value
 
     The _pg_analyzescatter and _pg_analyzescatterms functions return 0
     if there were no errors. A nonzero value indicates a failure.
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