Graph Type's Add Drop Shadow, as
https://helpx.adobe.com/illustrator/desktop/automate-visualize-data/visualize-data/add-drop-shadows.html
describes, and Add Legend Across Top, as
https://helpx.adobe.com/illustrator/desktop/automate-visualize-data/visualize-data/change-the-position-of-legends.html
describes.
- dropShadow: a shadow behind each column, bar, stacked segment, line
(line, scatter and radar) and pie wedge, just behind the series of
its layer, so areas and columns drawn in front don't hide the shadows
of the layer behind them.
- legendAcrossTop: the legend's swatches and labels left to right from
the plot's left edge, wrapping at the plot's width, the last row just
above the plot and anything drawn over it (radar and stacked-pie
labels).
Own choices, as the pages don't say: a shadow is a black copy 2 pt down
and right at 35% opacity; markers, areas and legend swatches cast none,
nor do stacked segments of 0; a graph with more than 200,000 shadowed
marks draws none.
New fields are written only when set. Graphs with default options draw
the same art as before.