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Fig. A.1


Examples of line profiles in TB scale (not corrected for the beam dilution): species and transitions are reported. The vertical dashed line stands for the systemic VLSR velocity (+1.7 km s-1, Lee et al. 2014). Red and blue curves are for the Gaussian fit. In the spectrum of the Cycle 1 (11,1–00,0)A 13CH3OH transition, a CH2DOH doublet containing the (54,2–53,2)e1 and the (54,1–53,3)e1 transitions is also shown (see Table A.1). In Cycle 4 spectra the (71,7–61,6)A CH3OH and the (82,6–71,7) SO2 transitions are also shown.

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