Add a Stacked Dot Plot to an Existing PlotSource:
Add a stacked dot plot to an existing plot. The locations for the points in the dot plot are returned from the function in a list.
A vector of numerical observations for the dot plot.
The approximate distance that should separate each point.
A random seed (integer). Different values will produce different variations.
Indicate whether the points should be added to the plot.
Additional arguments are passed to
Returns a list with a height that can be used as the upper bound of ylim for a plot, then also the x- and y-coordinates of the points in the stacked dot plot.