Gday Peter/Simon
Just to clarify, did you get a good calibrate with PEMPro???
If not, and the camera is not perfectly aligned, the X and Y axes can cross contaminate each other
ie RA PEC will show up in the "DEC" trace.
In normal operation with PEMPro, the DEC axis data ( as noted ) should be a relatively straight line, with only "seeing" ripples on it.
Andrew
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