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Fig. 2

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W31C: o-14NH3 and o-15NH3. Both isotopologues show emission from the source. Absorption in the line-of-sight is only seen in the o-14NH3 spectra. The emission line at vLSR ≈ 41 km s-1 in the o-15NH3 spectra, is an SO2 line from the upper sideband.

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