Optical spectroscopy. (a) The MgII line spectrum, (b) Hβ-[OIII] region and (c) Hα-[SII] region. The red curves represent the best-fit models. Gold Gaussian components represent the emission originating from the BLR, the magenta curve refers to the iron emission and navy blue power-law curves represent the continuum emission. Green Gaussian components reproduce the NLR emission and blue ones trace the outflowing gas in the NLR. Dashed vertical red lines indicate the location of the emission lines of interest at the systemic redshift. The vertical grey shaded region marks the channels affected by telluric absorptions which were masked during the fitting procedure.