Branching ratio (contour label) for the dissociative recombination of H3O+ to OH and H2O as a function of visual extinction, Av , and gas temperature for an ortho-to-para ratio of H2O and of H2O+ of 3:1. Column densities of H2O are from Sonnentrucker et al. (2010, 2015). The two black dots are at the parameters for models 1 and 2. For details see text.
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