OptionaldropVertical lines from each point down to the category axis. When absent, there are none. An
empty style ({}) draws them with the default, 0.75pt tx1 35%/65%.
OptionalgapDepth of the gap between rows of series in a 3D area chart, as a percentage of the bar width (0-500).
The kind of settings. These settings apply to an area plot.
Settings for area plots.