BC03 templates from the LePhare library projected into the SOM. The templates are shifted from z = 0.2 to 1.8 with steps of Δz = 0.01, and perturbed with Gaussian noise to mimic real photometry. The SOM is color coded to show their cell occupation, renormalized to the number density of COSMOS2020 galaxies to make this figure directly comparable with the left-hand panel of Fig. 2.