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Fig. 7
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As in Fig. 6, but showing the spectra of SO2 (J = 3−2 and J = 10 − 10) and SO (J = 2−1, J = 3−2, and J = 4−4). We keep the spectra of PN for reference in the top panels, as in Fig. 6. The black vertical lines in the spectrum of SO2 J = 3−2 are SO2 J = 16 − 15 (Table 1) and 13CH3OH J = 13 − 14 at 104.0266 GHz.
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