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realzequel t1_izfoddp wrote

I've seen a lot of charts in my time but never seen a double y-axis. Is that a thing?

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DeTrotseTuinkabouter t1_izfsans wrote

Definitely! Especially with mixed charts (bar and line) or two different units (e.g. price and quantity).

But they're not terribly common.

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MrMitchWeaver t1_izhpvhn wrote

Extremely common. One of the two series will clarify RHS to let you know that its axis is the one on the right.

I've even seen charts with three or more Y axes like two on each side.

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