Area series objects are created by the
area function. Each of the
hggroup elements contains a single patch object. The properties
of the area series are
The value where the base of the area plot is drawn.
The line width and style of the edge of the patch objects making up the areas. See Line Styles.
The line and fill color of the patch objects making up the areas. See Colors.
The x and y coordinates of the original columns of the data passed to
area prior to the cumulative summation used in the
Data source variables.