Spectra around the Na I D line-oſ-sight line for six slit positions of the MUSE cube shown in Fig. 19 and with four orientations with respect to the horizontal W-E orientation shown in colours: blue (0°), red (45°), green (90°), and yellow (135°). The left panels are for the 1″ and the right panels for the 1.5″ slits. The measured EWs and velocities are always consistent within the uncertainties for the different slit orientations and apertures. We note that the emission line to the left of Na I D absorption lines is the nebular He I at restframe 5875 Å.