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Interesting. I would have expected "lucky imaging" to be even shorter subs, as in poor seeing even 4s subs would show some wobble.
You mention the 1min subs had 3arcsec FWHM, but compared that to the stacked 4s subs' < 2arcsec FWHM. Curious about a comparison of straight up sub vs sub, or stack vs stack - would assume that 1min subs stacked would give better FWHM than individual 1min subs as well?
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