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Troy's nailed it I think, but this post sparks a question for me. I've never dithered; would dithering impact your RMS?
Might help to change the graph to display in arcseconds rather than pixels as well.
Oh, and tweaking the settings is mandatory. Min move for instance should be adjusted based on current seeing conditions; if it's too small, you'll be bouncing around chasing the seeing, but if it's too big you'll be getting less precise guiding than you're capable of.
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