axes.MoveToPoint (metrics.db_label_width, 0);
axes.AddLineToPoint (metrics.db_label_width, metrics.height - metrics.y_origin);
axes.AddLineToPoint (metrics.db_label_width + data_width, metrics.height - metrics.y_origin);
axes.MoveToPoint (metrics.db_label_width, 0);
axes.AddLineToPoint (metrics.db_label_width, metrics.height - metrics.y_origin);
axes.AddLineToPoint (metrics.db_label_width + data_width, metrics.height - metrics.y_origin);