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Opacity of background colour to the plot when a map container plot is configured.
The allowed range of values is 0–1. Prior to v9.7.0, the range was 0–100 but this was changed—see more.
If the container has a pattern such as plot/bargraph/xyplot), before the graph is drawn, the space behind the plot is filled with the colour $PlotBackgroundColor with opacity of $PlotBackgroundOpacity. Previously the background was that of the child map.
$PlotBackgroundOpacity for the current note may be set via the Appearance Inspector ▸ Plot tab, 'Background' slider control.