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Pro

X/Y-diagram (Pro)

A channel as a function of another
The X/Y diagram works exactly as the Y(t) diagram but has one of the channels as the x-axis: Y(x). 
The time diagram serves as the channel and time section selector for the X/Y-diagram: they contain the same channels.

Example
Having measured motor exhaust temperatures on one channel and rpm on another you will find it very informative to see temperature as a function of rpm.