Quick Calibration Question.


As I have a backlog of plugins to calibrate, I have a questions I cant seem to find a good answer too. When calibrating a scope. Is the reference the center of the graticule line, the bottom edge, or the top edge. Common since tells me it should be the center of the graticule is the alignment point. But I am hoping to confirm. Or am I asking my analog scopes to be a little too accurate?

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