Observed spectra (continuum-subtracted) of the [OIII]λ5007 line at three locations along the kinematical minor axis (PA = 355°). In green, blue, and red shadings, the spectra extracted within the nuclear region (black square in Fig. 2), the southern region, and the northern region (black rectangles in Fig. 10), respectively. With the same colours, the lines are the ALUCINE two-component fits for the same regions. Note that for the nuclear and southern regions a third component would be needed to fit the residual blueshifted and redshifted components, respectively. The nuclear spectrum is multiplied by a 0.2 factor for a better comparison. The vertical dashed line is the redshifted (with $v_{\mathrm{sys}}^{\mathrm{ion}}=1893$ km s⁻¹) [OIII] line.