Fig. 4
Left panel: predictions of the OH/H2O ratio from the Du et al. (2012) standard model, for constant (T, nH) conditions. Right panel: models with constant and time-dependent temperature. “Low Eb” models use the binding energies for species on the grains of the standard model of Du et al. (2012) while “high Eb” models use the higher binding energies for species with an OH bond from Garrod & Herbst (2006).
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