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Fig. 2

Resulting HIFI spectrum after subtraction of the best fit outflow component. Overplotted are the spherical envelope models for constant OH abundances of 1 × 10-8 (blue dashed), 8 × 10-9 (red solid with individual components red dotted) and 5 × 10-9 (pink dashed). Hyperfine components were simply added (see text).
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