Photometric uncertainties estimated from ASs: results for the F150W2 filter (a) and the F322W2 filter (b). In each panel, the black points represent the difference between the recovered and input magnitudes of the ASs, plotted as a function of input magnitude. The red points mark the median values in 0.5-magnitude bins, and the error bars indicate the corresponding dispersions (σ) obtained from the 2.5σ-clipped distributions. The dashed blue line marks zero.