Contour maps of SO₂ 18_4,14–18_3,15 for different velocity ranges, shifted to 0 velocity. The contours start at 5σ and follow steps of 5σ. The panel that includes the systemic velocity (3.7 km s⁻¹) is shown by the green contours in the first panel, while blue- and redshifted emission is represented by the blue and red contours, respectively. The yellow star shows the position of the source and the synthesized beam is indicated by the black filled ellipse in the bottom left corner of the first panel.