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Do you have PEC installed? If the errors are sine wave shaped then that is what a PEC curve usually looks like.
PEC makes a considerable difference to guiding results. I use Pempro.
PHD2 is quite a good autoguiding program. I read that it now offers multiple star autoguiding to help beat the seeing.
Seeing last night was not as good as a few nights ago.
Egginess across the image is guiding errors. Tilt is one or two corners with poor stars.
Greg.
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