Multi-line chart with uniform Y-scale

[irwvanroosmalen]

Currently when using a multi-line chart it can be hard to understand the relative scales of the lines I'm viewing. What I would like is the possibility to make the y-scale uniform for both lines (which is essentially the same as just having a single y-axis), and with that to be able to set the base of the scale to 0 or some other value for optimal viewability.

The alternative is for me to create a custom chart, but I feel that the current multi-line chart is so close to what I need that I'd prefer to see if you could implement a solution to this problem.

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