Examples of the different line profiles observed in the spectral survey. From the top to the bottom, we show in the left column a narrow line profile for HC¹⁸O⁺ (3–2) and HC₃N (25–24) with a two-component Gaussian fit and HC₃N (33–32) with a single broad component. In the right column,^HCO+ (3–2) has a line profile with redshifted self-absorption, SiO (4–3) has a broad component coming from the outflow, and the profile of CH₃OH (11₋₅–12₋₄) shows two velocity components tracing the accretion shocks. All the lines are plotted in a window of 70 km s⁻¹ centred on the rest velocity. The dotted red line shows the systemic velocity of the source at –43.13 km s⁻¹.