Vertical and horizonal spans

using Plots
gaston()

vspan and hspan can be used to shade horizontal and vertical ranges.

hspan([1, 2, 3, 4]; label = "hspan", legend = :topleft)
vspan!([2, 3]; alpha = 0.5, label = "vspan")
plot!([0, 2, 3, 5], [-1, 3, 2, 6]; c = :black, lw = 2, label = "line")

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