An AlarmZone of rectangle shape is specified by the rectangle bounded by the the data coordinates specified by the extents of the AlarmZone. An AlarmZone of elliptical shape is specified by the rectangle bounded by the the data coordinates specified by the extents of the AlarmZone. An AlarmZone of polygon shape is specified by the data specified of the PolygonData and bounded by the data coordinates specified by the extents of the AlarmZone. Applicable only for Cartesian charts.