Velocity-integrated maps of CH₃OH and CS reported in Fig. 1 with superimposed contours of the velocity-integrated emission of SiO at different velocity regimes. The colour images are as in Fig. 1. The SiO contours are at 5σ with σ = 5.8 mJy beam⁻¹ km s⁻¹. They correspond to the blueshifted high-velocity regime (blue), the blueshifted low-velocity regime (white), and the redshifted low-velocity regime (red) (see Sect. 3.2). The different cores are depicted with magenta stars and are labelled in black. The positions of the SiO peaks from this study are depicted with filled magenta triangles.