Excitation temperature from slab models with Tgas = 200 K and Tdust = 100 K for the OH lines at 79, 84, 119, and 163 μm for OH column densities of 1014, 1016, and 1018 cm-2, and varying H2 density and dust column density. The dashed line indicates the critical density of the upper level of each transition, the dotted line marks where the dust becomes optically thick.
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