SiO (8–7) channel map of the G35.20−0.74 N region, averaged over 2 km s^-1 wide velocity intervals. The central velocity of each channel is indicated in the upper left corner, and the velocity to take as reference is +32 km s^-1. Gray contour: 5σ level of the 870 μm ALMA continuum emission shown in Fig. 1. Black contour: 50% intensity level of the CH₃CN (19–18) K = 2 integrated emission as shown in Figs. A.1 and 5. The structures named “out-S”, “out-SW” and ‘out-NE’ are discussed in Sect. 3.2.3, while the spectra of these three regions are shown in Fig. 8.