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Originally posted by @dstansby in #12461 (comment)
Huh, and here I am manually adding lines to the cbar axes with axhline! You learn a new bit of the API every day...
_Originally posted by @jklymak in #12461 (comment)
We could extend the API of cb.add_lines to check if the first argument is a list of levels instead of a ContourSet, but that entails a bunch of extra kwargs to pass down.