Emission features in the Hα line wings. Upper: spectrum of Hα, extracted from a 2.5 arcsec (diameter) aperture centred on the CON position. Blue and red shaded regions are overlaid and labelled from 1–4. Regions 1 and 4 contain the highest velocity (140 < V > 305 km s⁻¹) blue- and redshifted gas, respectively. Regions 2 and 3 map include the slower (85 < V > 140 km s⁻¹) gas. Middle: emission of the fast blueshifted (region 1; blue contours) and slower redshifted (region 3; orange contours) Hα gas, overlaid onto the integrated Hα line map (log-scaled). Lower: emission of the fast (region 4; orange contours) and slower (region 3; red contours) redshifted Hα gas. White box shows the region shown in the middle panel.