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     The _pg_chartscatter function displays a scatter diagram for a
     single series of data.
 
     The _pg_chartscatterms function displays a scatter diagram for
     more than one series of data.
 
     The <xvalues> and <yvalues> arguments are two-dimensional arrays
     containing data for the x axis and y axis, respectively. Columns
     for each array hold data for individual series; thus the first
     columns of <xvalues> and <yvalues> contain plot data for the first
     series, the second columns contain plot data for the second
     series, and so forth.
 
     The <n>, <rowdim>, <nseries>, and <serieslabels> arguments fulfill
     the same purposes they fulfill for the _pg_chartms function. See
     _pg_chartms for an explanation of these arguments.
 
     Return Value
 
     The _pg_chartscatter and _pg_chartscatterms functions return 0
     if there were no errors. A nonzero value indicates a failure.
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