If you just wish to seperate the data streams for clarity, and you dont care too much about the vertical scale eg for simple digital data, you can simply displace one of the data streams so it displays below (or above) the other plot.
This is handy for creating space saving graphs of a few signals, for diagnostics early on perhaps, where you dont need scales.
Using the "duplicate scale" feature can also come in handy.
You can elaborate on this, even programmatically calculate the displacing if you need to.
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