Contour plots for the joint posterior distributions of α and M₀ across the 11 photometric bands (g, r, i, z, y, J, H, K_s, W1, W2, and W3). For each band, the bottom-left panel shows the contour of α versus M₀, while the marginal posterior distributions for the two variables are displayed on the top-left and bottom-right panels, respectively. The dashed vertical lines in the marginal distributions represent the 1σ credible intervals.