Fig. 7
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Observed SO2, 34SO2, and 33SO2 spectra (in TB scale, see Table 1) extracted at the emission peak: α2000 = 03h29m03.s75, δ2000 = +31°16′03.′′8. Transitions and corresponding upper level energies are reported. The vertical dashed line stands for the ambient LSR velocity (+8.6 km s−1, Chen et al. 2009). The 34SO2 line at Eu = 55 K could be contaminated by 13CCS emission with Eu = 22 K (see Table 1).
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