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hi Stefan. the general idea behind guiding is not to aim for a flat guide graph - rather you should aim for round stars. The guide graph will show you the errors in the mount that are being corrected by the guider - if that is flat, then the guider is not doing anything. If your settings are such that errors persist and build up to the point that a major correction must be made, then you will get occasional spikes.
What software and settings do you use? From what I have read, I think that you will get best results using a guide update of about 1 second with the G11. That will give you a guide graph the jitters around due to seeing fluctuations and mount errors, but the stars will be good. I don't know what the best mount correction rate is, but around 0.5 would probably be a good starting point.
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