From left to right: spectra in brightness temperature (T_B scale) of CH₃OH(2_kk−1_kk), CS(2-1), SO(2₃−1₂), and SiO(2–1) extracted at the positions of the emission peaks along the red- (top panels) and blue-shifted (bottom panels) lobes (see the red and blue crosses in Fig. 6). For SiO, the dataset with the beam of 2″.56 × 2″ 14 was used (see Table 1). The transitions producing the emission methanol profiles are labelled, and the corresponding frequencies are marked by vertical black segments (see Table 1). The CH₃OH spectra are centred at the frequency of the 2_0,2−1_0,1 A transition: 96741.38 MHz. The vertical black lines at +8.5 km s⁻¹ indicate the systemic velocity (Podio et al. 2021).