Velocity plots of absorption lines (normalised spectra, top three panels) compared to that of emission lines (continuum-subtracted spectra, bottom four panels). The quasar continuum has been subtracted to isolate the emission lines. The grey absorption features at v <  −200 km   s^-1 (resp. v > 450 km   s^-1) in the C ivλ1550 panel (resp. Mg iiλ2796) are due to C ivλ1548 (resp. Mg iiλ2803). The C ivλ1550 panel shows the UVES spectrum smoothed by 4 pixels. Other panels present X-shooter data. The features at v =  −550 and +350 km   s^-1 in the [O iii]λ5007 panel are skyline subtraction residuals.