Fraction of detected sources per SExtractor flags indicating blending (flag 2), contaminated photometry (flag 1), both (flag 3) or none (flag 0) versus observed NIRCam/F200W magnitude. The rows correspond to the CEERS_1 (top) and HUDF_1 (bottom) observing strategies. The dashed lines indicate the flag fractions among photometric redshift outliers (summing to one), as defined in Sect. 4.1. The dotted lines represent the flag fractions in the whole detected sample (summing to one). The solid black line shows the ratio between the photometric redshift outlier rates η_0 + 2 assuming all the sources have uncontaminated photometry (flags 0 or 2), and the standard outlier rates. The error bars are propagated Poisson errors.