Results from applying the models to the DGS sample and trends with model parameters. The vertical axis in panels a–c is M(H₂)_total/M(H₂)_CO (the ratio of the total M_H2 determined from the model and the CO-bright M_H2 determined from CO observations and the Galactic conversion factor) versus, on the horizontal axis, (a) G₀, (b) density, and (c) A_V. d: observed L_[C II]/L_CO(1−0) vs. model A_V. Spearman correlation coefficients (ρ) and p-values in parenthesis are indicated within each panel. Red points are solutions for the DGS galaxies with CO detections. Open symbols are upper limits due to CO non-detections. The masses determined by the model for the individual galaxies have been scaled by their proper L_TIR.