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James, is it a problem?
The graph looks like its -/+ 0.6 pixels, perhaps higher as it reaches the 1080 milestone. You've not provided your imaging train arcsec/pixel combination, but even then I can't see it as being an issue given you're probably being governed by seeing or other factors. I'm assuming you've trained PEC.
If you're attempting to guide through the Ha filter, make sure you bin 2x2 the guide chip to improve its sensitivity. May throw the arcsec/pixel combination out as opposed to the imaging chip, but with MaximDL's intelligence when it comes to monitoring the guide star centroid, it won't be an issue (sub pixel).
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