[O III] λ5007 surface brightness of blueshifted narrow component (same map as in the corresponding panel in Fig. 10). The black line overlay shows the VLA 8.4 GHz continuum data obtained for Thean et al. (2000) as processed by Zhao et al. (2016). The contour levels cover a range from 0.001 to 0.007 mJy beam⁻¹ in steps of 0.001 mJy beam⁻¹. The angular resolution in radio is and the position angle of the point spread function ellipse is ∼10° (Zhao et al. 2016).