Individual 2D spectra around the [O III]λ5008 region (from top to bottom: PA = −155 deg, −164 deg, +177 deg, and +166 deg east of north, i.e. in these figures, north is down and south is up). The total observed emission is shown in the left panels, while the unresolved emission (continuum+broad component) has been subtracted in the right panels to better highlight the spatially-extended narrow [O III] emission alone. Each panel is 4000 km s⁻¹ wide. The main skyline residuals are masked out by a white hashed grid. Top-left panel: total extracted 1D spectrum, with the corresponding Gaussian fits. The coloured regions show the velocity bins used in Fig. 7.