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When drift aligning, you completely ignore the RA errors. Just watch the red DEC trendline. Doesn't matter at all what the purple RA is doing until you've finished drift aligning, have calibrated, and are actually guiding. You will see it flatten right out then.
I was doing some testing the other night, and I found it much easier to follow with the graph displaying pixels instead of arcseconds. Go into the settings button of the graph there, and choose pixels. Might be just the way I'm wired, but I found it easier, and the graph wasn't as spikey.
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