Results of Bayesian analysis with a 3σ cut in CO and no cap on GDR. Top row is K_dark (left) and uncertainty in K_dark (right), both with the color scale to the right and in units of M_⊙/ pc². The second row is X_CO (left) and uncertainty in X_CO (right), both with the color scale to the right and in units of M_⊙/ pc² per K km s^-1. Bottom row is GDR (left) and uncertainty in GDR (right), both with the color scale to the right. As with the other figures, we have adopted the variable-beta dust surface density shown in Fig. 2.