Fig. A.1.
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Spectral modelling of the 2007 SDSS spectrum (MJD 54156; left) and of the 2015 LAMOST spectrum (MJD 57155; right). Top: The original spectrum is shown in blue, the best fit (including all the components) in orange, the stellar component in green, the NELs in red, and the power law component in purple. Bottom: The modelling residual is shown in grey. In both panels, the grey dashed lines show the location of the N III λ4640 and the He II λ4686 emission lines.
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