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─────Run-Time Library───────────────────────────────────────────────────────
 
     The _pg_chartpie function displays a pie chart for the data
     contained in the <values> array. Pie charts are formed from a
     single series of data──there is no multiseries version of pie
     charts as there is for other chart types.
 
     The <explode> array must be dimensioned so that its length is
     greater than or equal to the <n> argument. All entries in
     <explode> are either 0 or 1. If an entry is 1, the corresponding
     pie slice is displayed slightly removed from the rest of the pie.
 
     For example, if the <explode> array is initialized as
 
          short explode[5] = {0, 1, 0, 0, 0};
 
     the pie slice corresponding to the second entry of the
     <categories> array will be displayed "exploded" from the other
     four slices.
 
     Return Value
 
     The _pg_chartpie function returns 0 if there were no errors. A
     nonzero value indicates a failure.
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