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  Constant:  _PG_BARCHART, _PG_COLUMNCHART, _PG_LINECHART,
             _PG_SCATTERCHART, _PG_PIECHART, _PG_PLAINBARS,
             _PG_STACKEDBARS, _PG_POINTANDLINE, _PG_POINTONLY,
             _PG_PERCENT, _PG_NOPERCENT
 
  Include:   <graph.h>
 
  Context:   _pg_defaultchart
 
  Synopsis:  Specify the type and style of the default chart for the
             presentation-graphics routines.
 
     The <charttype> argument of _pg_defaultchart specifies one of five
     types of charts:
 
     Chart-Type Constant     Meaning
 
     _PG_BARCHART            Bar chart
     _PG_COLUMNCHART         Column chart
     _PG_LINECHART           Line chart
     _PG_SCATTERCHART        Scatter chart
     _PG_PIECHART            Pie chart
 
     The <chartstyle> argument specifies the style of the chart. Each
     of the five types of charts can appear in two different chart
     styles, specified by the constants below:
 
     Chart Type     Chart Styles Available
 
     Bar            _PG_PLAINBARS, _PG_STACKEDBARS
     Column         _PG_PLAINBARS, _PG_STACKEDBARS
     Line           _PG_POINTANDLINE, _PG_POINTONLY
     Scatter        _PG_POINTANDLINE, _PG_POINTONLY
     Pie            _PG_PERCENT, _PG_NOPERCENT
 
     For pie charts in the _PG_PERCENT format, percentages are printed
     next to each slice. For bar and column charts, the styles are
     applicable only when more than one series appears on the same
     chart. The _PG_PLAINBARS style arranges the bars or columns for
     the different series side by side, showing relative heights or
     lengths. The _PG_STACKEDBARS style emphasizes relative sizes
     between bars and columns.