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Thanks Fred....I think I may well have my PE curve inverted, I will try it the other way up! I think the noise is a centroiding issue in AA combined with a saturated star - I will try a redo of PEC with my imaging CCD - this curve was with my guidecam (a QHY5) - might also be impacted by a poor polar alignment....or perhaps my RA worm is up a bit to tight or has a high spot, I do see similar levels of RA chatter when guiding.
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