Integrated emission of the ¹³CO (2–1) line over five different velocity ranges (see Fig. 5) is shown in colour scale. The point-like emission seen towards Clump-1 in the [+5.6, +6.7] km s⁻¹ and [+9.2, +13.2] km s⁻¹ velocity ranges is due to high-velocity emission associated with molecular outflows (see Leurini et al. 2009). Black contours show the corresponding integrated C¹⁸O (2–1) emission from 30% of its peak emission in steps of 30%. The white contours in the bottom right panel show the integrated C¹⁸O (2–1) emission in the range − 3.5 ± 0.5 km s⁻¹ from 5 to 45% of the corresponding peak emission in steps of 10%. The B1–B8 labels are as in Fig. 1.