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Well, from your first graph it appears PEC is working on your "X err pix" so your camera is oriented with the x axis aligned with RA. Also, there appears to be some drift in Dec maybe due to slight polar misalignment.
There however is no evidence of the swings from positive to negative pixel errors in your dec graph that you saw when guiding. this probably indicates its not a mechanical issue and that guiding settings are the cause of you erratic Dec graphs you have seen. This is of course looking at the first graph.
Its a little hard to tell if those spikes in the second and 3rd graphs are significant because there is no scale. However, they don't look smooth enough to me.
Sounds like playing with those pix/sec settings after calibration may help, where are these settings?
Josh
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