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GtkPlotCanvasChild * gtk_plot_canvas_line_new (GtkPlotLineStyle style,gfloat width,const GdkColor *color,GtkPlotCanvasArrow arrow_mask);
void gtk_plot_canvas_line_set_attributes (GtkPlotCanvasLine *line,GtkPlotLineStyle style,gfloat width,const GdkColor *color);
void gtk_plot_canvas_line_set_arrow (GtkPlotCanvasLine *line,GtkPlotSymbolStyle style,gfloat width,gfloat length,GtkPlotCanvasArrow mask);