Upper panel: 2QZ0028-28 H band spectrum extracted from the central 0.5 arcsec, along with the various components used for the fit (see Appendix A for details). Vertical dashed lines indicate the rest frame wavelength of each line, by taking the [OIII]λ5007 line peak for reference. Lower panel: residuals of the fit. The green vertical lines enclose a the spectral zone affected by strong sky line residuals.