Fig. 4
In black: HDO lines observed with HIFI, IRAM, and JCMT. In red: best-fit model obtained when adding an absorbing layer with an HDO column density of ~2.3 × 1013 cm-2 to the structure (see details in text). The best-fit inner abundance is 1.7 × 10-7 and the best-fit outer abundance is 8 × 10-11. The continuum shown for both the 894 GHz and 465 GHz lines, refers to SSB data.
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