Merged NOEMA–IRAM 30 m data. Each panel presents the emission of the SO J_N = 6₅–5₄ line (color map) in a different velocity channel. In the upper right corner of the panel, the channel V_LSR (in kilometer per second) and the range of plotted intensity (in square parentheses in milliJansky per beam) are reported. The red boxes and ticks identify the panels corresponding to the central velocities, that is |V_LSR − V_sys| < 3 km s⁻¹. The white crosses mark the positions of the seven strongest peaks of the 1.37 mm continuum emission.