Profiles of the molecular lines at 1 mm and 2 mm bands, as detected in Qiu et al. (2017) and in the current observations. The three vertical dotted lines at v − v_sys = −200 km s⁻¹, v − v_sys = 0 km s⁻¹, and v − v_sys = +200 km s⁻¹ delimit the blue and red kinematical components. The wavelengths and relative intensities of the split components of ¹³CCH (2 − 1), CH₃CN (9 − 8), and CH₃CCH (14 − 13) are marked by red lines.