Fig. 2
In black: D2O transitions observed with HIFI and JCMT. The CH3OD (70–60+) transition at 316.795074 GHz contaminating the para−D2O (11,0 − 10,1) line profile has been subtracted for a direct comparison with the D2O best-fit model. In red: best-fit model obtained when adding an absorbing layer with N(para–D2O) = 1.1 × 1012 cm-2 and N(ortho–D2O) = 1.4 × 1012 cm-2. The resulting inner abundance is 7 × 10-10 and the outer abundance is 5 × 10-12.
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