Distribution of measured-to-true magnitude recovered using SExtractor, from three arbitrary z-band images that only differ from the PSF FWHM (i.e. 0.7, 0.9, and 1.1 arcseconds, from left to right). Photometric parameters used (AUTO, ISOCOR, and DETMODEL) are arranged from top to bottom. Light blue tracks represent the running 25%, 50% (median), and 75% quantiles. Scale bars represent the background cells counts.
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