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One of the software writers went over roughly how it works. Its in that astro channel you tube video presentation on the PHD website. He mentions the best thing you can do for improving your autoguiding is to turn off the autoguider and observe how your mount performs. So I think its measuring drift in RA and Dec, PE, flex etc. It may also be measuring FWHM to get an idea of the seeing.
I have found it to work and be a good tool as its measuring the conditions on the night rather than a canned approach which may not match the current conditions.
Greg.
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