Multiple Axis with Plots.jl

Question

Is there a way to have the second dataset plot on a separate axis, overlaid on the first plot?

using Plots; gadfly(size=(800,400))

plot(Vector[randn(100)], line = ([:green], :step))

plot!(Vector[randn(100)], line = ([:red], :step))

Answer 1

It's easy, but doesn't work with Gadfly. It should work fine with PyPlot and GR. Here's an example: