Brightness versus size diagram of all the sources in one of our pointings. The stellar locus prior to the PSF-homogenization (black) is wider and therefore subject to greater galaxy contamination at the faint end than the stellar locus posterior to the correction (blue) because the PSF initially varies across the field. The sources more compact than the stellar locus are artefacts from the source extraction; they hold no relevance for our analysis since they do not pass the star selection (see Fig. 3).
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