Examples of line profiles in T_B scale (not corrected for the beam dilution): species and transitions are reported. The vertical dashed line stands for the systemic V_LSR 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 (1_1,1–0_0,0)A ¹³CH₃OH transition, a CH₂DOH doublet containing the (5_4,2–5_3,2)e1 and the (5_4,1–5_3,3)e1 transitions is also shown (see Table A.1). In Cycle 4 spectra the (7_1,7–6_1,6)A CH₃OH and the (8_2,6–7_1,7) SO₂ transitions are also shown.