What is increase of current directed to extrusion motor for each increase in Manual Extrusion Speed?

I've located the rails on the Rambo 1.3 board on my taz 4 that supply the motors, and have been trying to measure the current directed to the extrusion motor for each speed setting. I'm doing this so I can avoid calculating all of the phases of the stepper motor itself. But it's proving to be difficult to measure still, so I was wondering is there is any documentation or data available on the increase of current per setting?
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