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Fig. 1

image

O i, OH and OH+N = 1 ← 0 spectra of sightlines in the first quadrant, along with CH and HF J = 1 ← 0 spectra. All five transitions are only available for W31C and W49N. Model fits are overlaid in red. For O i , CH and HF one emission line component was added where needed. For G10.47, the hyperfine splitting is indicated at the 120 km s-1 component (green bars). All spectra are normalized by the continuum level.

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