Upper panel: MUSE continuum-subtracted Hα image. Middle panel: MUSE continuum-subtracted [OIII]λ5007.Lower panel: MUSE continuum-subtracted [NII]λ6583. The position of the southern spot is marked with a purple arrow and circle. The white solid boxes denote the spectropolarimetry bins corresponding to Fig. 2, while the dashed white circles account for the annular regions of Fig. 4 (only shown in the middle panel for clarity). The direction corresponding to the polarization angle θ and its perpendicular are superimposed. The latter direction represents the proposed EELR axis. The black dashed lines represent an arbitrary 60°aperture for the ionization cones, drawn to guide the eye.