The example below has 3 (technically 6) separate plots that share a common Y-axis. I've seen many examples of shared x-axis, but I cannot figure out how to do 3 like below in pgfplots.
Note I would like the three plots to appear attached to each other like in the example.

horizontal sep=0pt. Does that help? – Stefan Pinnow Dec 20 '21 at 14:41