Average spectra of selected molecules extracted from a 1" aperture towards positions R1 and B1 (see Fig. 1). The dashed black line indicates the systemic velocity of 6.8 km s⁻¹, while the red and blue dashed lines indicate the outer integration limits for the respective molecule used in Figs. 1, 2, and A.3. Despite the narrow band not covering all the H₂CO emission, we used it for the H₂CO map as it shows more structure.