Robofire steps/HDF meaning?

Can someone elaborate on the steps/HDF computation? What does it mean? Something like x number of steps modifies the HDF by y amount? what is the y amount?

Also I noticed something strange, maybe just a coincidence but If I compute the temperature compensation for my focuser I get a value in steps/degree that is weirdly double the steps/HDF reported by Robofire.

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Means how many steps are needed to change the HFD by 1 in the not linear part of the vcurve. Its something related to Voyager AI.