Fig. 2
Gas-phase abundance ratio of the singly deuterated isotopologues of methanol, [g-CH2DOH]/[g-CH3OD], as function of the initial water ice deuteration. The dust temperature is taken as 100 K. The dotted line corresponds to Eq. (36). The ratio observed towards IRAS 16293-2422 is represented by the orange hatched zone (Parise et al. 2004).
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