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Gets the plot area of the chart.
The plot area is the region where the chart data series are drawn.
IPlotArea PlotArea { get; }
ReadOnly Property PlotArea As IPlotArea
IChart chart = worksheet.Shapes.AddChart(ChartType.ColumnClustered, 20, 20, 300, 200).Chart;
IPlotArea plotArea = chart.PlotArea;
IChartFormat format = plotArea.Format;