X-Shooter VIS-arm 1D spectra (upper panel) and 2D spectra (bottom panel) covering the rest-UV wavelengths from ∼1180 Å–1940 Å. The spectrum (black) is binned by a factor of 9 to increase the S/N of the continuum and other spectroscopic features, while 1σ uncertainty is presented in red color and orange line shows 0 flux level. The displayed 1D spectrum is continuum subtracted. The location of the reported and analyzed emission features (HeIIλ1640 and CIII]λλ1907,1909) are marked with thick black markers, while the positions of the other lines reported in Vanzella et al. (2018) from FORS spectroscopy (Lyα, NVλ1240, [CII]λ1335.71, [SIV]λλ1393,1402, CIVλλ1548,1550) are marked with thin blue markers.