BoxExtraSpacing

is an option for BoxWhiskerPlot that specifies spacing adjustments to be applied when plotting multiple boxes.

Details and Options

To use BoxExtraSpacing, you first need to load the Statistical Plots Package using Needs["StatisticalPlots`"].
Valid settings are non-negative numbers or a list of non-negative numbers. The default setting is 0.
A setting of 1 is equivalent to the space used for a single box.
BoxExtraSpacing->{s₁,s₂,…} specifies that successive spacings s_i should be used cyclically for successive plots.

A default box and whisker plot for two datasets:

Add an additional box width between the plots:

Specify different spacings between plots:

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