Online Material
![\begin{figure}
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Figure 2: Predictions of the Meudon-PDR model for a slab of Av = 1 mag illuminated from both sides. The radiation field and gas density are given in each panel. Full lines: n(OH+)/n(H2O+), dotted lines: n(OH)/n(OH+), dashed lines: n(H3O+)/n(OH+). Equation (2) determined for each Av in the model is shown in green. |
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