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Fig. 3


Abundances of OH+, H2O+, H3O+, and C+, predicted by the Meudon PDR model as a function of visual extinction for a radiation field of χ = 10   000 in units of the local interstellar radiation field according to Draine (1978) and a pressure of P = 108 K cm-3, as applicable to the Orion Bar.

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