Velocity integrated maps of the molecules that do not peak on core #6. The velocity range is indicated on the top of each box. For each molecule, grey scale images correspond to the large-scale map with large dynamics in intensity, while the colour maps focus on a narrower region around core #6 with smaller dynamics in intensity (as indicated by the two wedges on the right side of each panel). Temperature is the main beam brightness temperature T_mb. The continuum map obtained from the Cont. 2 spectral window data is plotted in the bottom right panel. The contours represent the 5–10–20σ continuum emission, with 5σ ≈ 9mJy beam⁻¹. The position is relative to the centre of the continuum core #6. The beam is represented in the bottom left corner of each map. The CO emission is completely filtered in the 95–97 km s⁻¹ velocity range around core #6 (see Fig. A.2), but its presence is confirmed by the C¹⁸ O emission.