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John, I actually think it looks rather normal considering the equipment capabilities. Have you programmed PEC yet - Vixen made the firmware available sometime ago?
The Ra and Dec stats you provided, is that over at least two or three worm periods? It is not easy to determine a precise trend as seeing interferes with the corrections. This is the reason why when you program PEC, you need to do so over at least five worm periods to level out the seeing. I usually go for eight or nine worm periods before creating a good PEC curve.
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