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Yes, a flat line is the target, however this would essentially mean 0 guide corrections/tracking errors... With a HEQ5, a flat line is unlikely... Providing your tracking errors and guide corrections are lower than your imaging resolution you can be assured that your images will come out just fine...
I don't have screenshots of my Maxim guide graph, however I run 20 ~ 30 min subs day in day out with my HEQ5 and my guide graph looks much the same as yours, oscillations are perhaps a little smoother, but I think Matt's suggestion about increasing the hysteresis should sort that out for you.
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