Analysis of the broad emission lines in VIK J2318−31. Top panels: zoomed-in view of the rest-frame CIV (left) and MgII (right) emission lines of VIK J2318−31. The grey line shows the rest-frame spectrum. The best-fit, continuum plus emission lines, is shown as a solid magenta line. In both cases we used two Gaussian components (dashed magenta lines), but in the case of the MgII line we fixed the width and the normalisation of the components to be equal and the relative position of the peaks to 7.2 Å. The Balmer and the iron pseudo-continuum contributions are shown as a dotted blue line and a dashed-dotted orange line, respectively. Bottom panels: residual of the fit divided by the error on the spectrum at each wavelength. Shaded areas indicate ±1,2σ.