Distribution of 226 eRO-ExTra sources with reliable counterparts (p_any > 0.17) and accurately measured LS10 fluxes in z-W1 vs. 𝑔-r plane. Black stars indicate the radio-detected sources. Tracks of active and inactive galaxies are included and described in the figure legend. The black dashed line (z–W1–0.8×(𝑔 – r)+1.2=0) marks the division between Galactic (below) and extragalactic (above) sources. The theoretical tracks and the marked division between Galactic and extragalactic sources are both from Salvato et al. (2022).