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     The _pg_analyzepie function analyzes a single series of data
     without actually displaying the graphic image.
 
     The _pg_analyzepie function fills the chart environment for a pie
     chart using the data contained in the <values> array. All
     arguments are identical to those for the _pg_chartpie function.
 
     Return Value
 
     The _pg_analyzepie function returns 0 if there were no errors. A
     nonzero value indicates a failure.
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