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I don't know the field well, Peter. The stars look bigger than in some of the images I've seen but they may have had significant star reduction during the processing.
Do you have something that will measure the FWHM of a few raw subs? The SubframeSelector script in PI will analyse a group of subs. FWHMEccentricity will do a nice map of a single sub to show you how the FWHM and Eccentricity varies spatially. Both useful tools for checking the quality of your data...
Cheers,
Rick.
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