Comparison of classification performance between multiband (solid) and single-band (dashed) analyses using ROC curves for the r, i, and z bands, respectively shown in three panels from the left to right. In each panel, ROC curves corresponding to different observation epochs (N_obs, X where X ∈ {r, i, z}) are shown in different colors. Legends indicate the AUC values for each curve, with multiband listed first, followed by single-band for the same epoch.