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Ray, I was using a "High" dither in PHD2 for the above test, which I think is 4 pixels or about 18 arcseconds.
Not sure how to compare the FWHM or HFR across images, because the image scale changes (increases) as one drizzles more. Thus the reported HFR increases from examples 1-5 above. I guess you'd have to rescale it all back to the same resolution to do a fair comparison?
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