Return true if chartType is one of Line subtypes. Subtypes set corresponds to the appropriate set in PowerPoint (see "Change Chart Type" dialog in PowerPoint): ChartType::Line, ChartType::LineWithMarkers, ChartType::PercentsStackedLine, ChartType::PercentsStackedLineWithMarkers, ChartType::StackedLine, ChartType::StackedLineWithMarkers, ChartType::Line3D....true if chartType is one of Line subtypes. Subtypes set corresponds...dialog in PowerPoint): ChartType::Line , ChartType::LineWithMarkers...