Relative change in the SMAD of δz/(1 + z) of the KiDS-Bright sample as a function of the fraction of removed galaxies (left), after applying cuts (based on GAMA) on the photometric dataset, each employing SOM cell averages, based on ⟨r⟩ (blue-circle), relative difference |Dz| (orange-square) and absolute |Δz| (green-diamond). Right panel: Variation in the mean photo-z residual for the same setups as in the left panel.