Results of our edge-on models described in Sect. 3.4. The panels show the gas temperature T (upper panels), I_FIR, I_{[ C ii ]}, I_{[ C ii ]}/I_FIR, and I_{CO (1 − 0)} (middle panels) and C⁺, C, and CO fractional abundances (lower panels) versus physical scale, for the gas densities n_H = 3.0 × 10³ cm^-3,1.6 × 10⁴ cm^-3,4.0 × 10⁴ cm^-3 (left to right panels), and A_V,los = 0.5, 2.5, and5.0. We note that the gas temperature does not vary with A_V,los.