Jil5 companion spectrum (light blue), together with two additional spectra extracted from the region between Jil5 and the QSO host galaxy (labelled as Jil5a and Jil5b, at 7.4 and 4.8 kpc from the QSO nucleus, respectively, also indicated in Fig. 12 with red crosses). The dark blue spectrum has been extracted from a region at a distance of 4.8 kpc from the nucleus (as for Jil5b) but covering the PSF wing extending towards the north. In order to ease the visualisation, we added vertical offsets to the spectra. This figure highlights a velocity gradient of a few hundred km s⁻¹ across a few kiloparsecs (see also Fig. 11), possibly indicating feeding processes or a tidal tail due to the interaction between Jil5 and the QSO host galaxy.