Increasing rotor-to-fork leg distance

So, I'm still being thick, are the measurements to the inside of the sliders or to the center of them or what? I'm asking because I've fought two front ends lately and in both cases was looking for a double-check. Kind of silly since my rider was sitting right there with everything original!
inside of the sliders to the faces of the hub, the frame centre line reference is really only there to help align the rear hub with the front
 
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