Fig. 8

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SourceExtractor output parameters for NGC 6822, intended to illustrate the typical selection cuts applied to our photometric catalogs. Purple points are the sources matched in all four Euclid bands, while yellow points correspond to our selections. In the top panel, we retain all sources with a measured FWHM in VIS of between 1.2 and 2.5 pixels, while in the bottom panel, we show our adopted selection in the plane defined by central surface brightness versus aperture magnitude. Sources with a FWHM smaller than 1.2 pixels (namely smaller than the PSF) are likely artifacts, while sources with large FWHM values and/or large values of μmax compared to aperture photometry are either saturated stars or extended objects (background galaxies or resolved star clusters).
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