Moment 1 map of the central 1″ × 1″ of the SO₂ emission. Colour scale is in km s⁻¹. The star is placed on the peak brightness position, velocities are measured with respect to this position. From left to right: (1) complete moment 1 map; (2) same as 1, but with an intensity cutoff at 0.002 Jy; (3) same as 1, but with an intensity cutoff at 0.005 Jy; (4) same as 3, but with contours at steps of 0.25 km s⁻¹ away from zero. The black dotted line indicates the previously determined position angle of the system. The ALMA beam FWHM is shown in the top right corner.