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
basevalueThe value where the base of the area plot is drawn.
linewidthlinestyleThe line width and style of the edge of the patch objects making up the areas. See Line Styles.
edgecolorfacecolorThe line and fill color of the patch objects making up the areas. See Colors.
xdataydataThe x and y coordinates of the original columns of the data passed to area prior to the cumulative summation used in the area function.
xdatasourceydatasourceData source variables.
© 1996–2018 John W. Eaton
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https://octave.org/doc/interpreter/Area-Series.html