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Yeah I had a feeling that wasn't quite right.
I was thinking that if there was a slight breeze, not a gust, just a real light breeze, enough to shift the image a couple of pixels for a little while. Or maybe something in the image train shifts or flexes just a little. Random events.
The autoguider would attempt to correct this and meantime it is recorded and subsequently this PEC+guiding correction would be applied every time. Breeze or no breeze. A random event recorded over a cyclic event.
Makes sense to me to have autoguiding off while recording PE.
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