Histograms of LS10 i-band magnitudes for the three XMM-SERVS subsamples: ELAIS-S1, W-CDF-S, and LSS. The magnitudes are displayed as normalized densities to allow for direct comparison across the fields. These distributions extend to fainter magnitudes than those shown in Figure 15, accounting for the increased η_P denoted in Table 4. As the depth reached in PICZL’s LS10 training set is limited toward brighter magnitudes, a direct comparison between subsamples is only valid when conducted within a controlled parameter space, as shown in Figure 13.