Keck/DEIMOS spectrum around the [OII]λλ3726,3729 region of XID2028. The spectrum is normalized so that the intensity of the strongest emission line (in the VIS+NIR wavelength range) of the nuclear aperture is unity. Superimposed on the spectrum are the best fit non-parametric analysis components (solid and dashed blue curves, with arbitrary normalization in order to ease the visualization). The red solid curves represent the sum of all components, including the power-law. Dotted lines mark the wavelengths of the [OII] emission lines.