Return true if chartType is one of Area subtypes. Subtypes set corresponds to the appropriate set in PowerPoint (see "Change Chart Type" dialog in PowerPoint): ChartType::Area, ChartType::PercentsStackedArea, ChartType::PercentsStackedArea3D, ChartType::StackedArea, ChartType::StackedArea3D, ChartType::Area3D....true if chartType is one of Area subtypes. Subtypes set corresponds...dialog in PowerPoint): ChartType::Area , ChartType::PercentsStackedArea...