Fig. 6
Left panel: chemical structure and temperature of a PDR with G0 = 104 and nH = 104 cm-3. The thick black line is the gas temperature (left axis). The other lines represent the abundances (left axis) of H (black), H2 (orange), C+ (blue), C i (violet), and CO (green). Right panel: H2 (orange) and CO (green) column densities as a function of the temperature. The dashed lines are the best power-law fits to the distribution (see Sect. 6.1).
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