15.4.6.2 Area Series

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

basevalue: The value where the base of the area plot is drawn.
linewidth
linestyle: The line width and style of the edge of the patch objects making up the areas. See Line Styles.
edgecolor
facecolor: The line and fill color of the patch objects making up the areas. See Colors.
xdata
ydata: The x and y coordinates of the original columns of the data passed to area prior to the cumulative summation used in the area function.
xdatasource
ydatasource: Data source variables.

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https://octave.org/doc/v6.3.0/Area-Series.html