Line intensity as a function of velocity and position along the dashed line in Fig. 6 (position angle –56°). Different colors correspond to different molecular species as indicated in the bottom right. The cross in the bottom left gives the velocity and angular resolution. The dotted vertical line marks the position of core C, while the dashed line outlines the velocity trend observed in the H₂ CO and CH₃ OH lines. Contour levels range from 15 (5σ) to 225 in steps of 30 mJy beam⁻¹ for CH₃ OH, from 18 (5σ) to 338 in steps of 40 mJy beam⁻¹ for H₂ CO, and from 16 (4σ) to 32 in steps of 3 mJy beam⁻¹ for H₂ CCO.