Fig. 6
Spectral modelling of the Hβ–[O iii] region for two representative QSO spectra. The black line correspond to the observed QSO spectra and the red curve represents our best fit model. The model consists of individual Gaussian components for the emission lines (Hβ–magenta, [O iii]–green, Fe ii–blue) above a straight line for the local continuum. The residual of the model are shown in a dedicated panel below.
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