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Fig. 4.


Left panel: light curve of Mg II line luminosity log10LMgII obtained with the spectral decomposition method, with the mean value subtracted (blue); running mean calculated for the minimum timescale of 100 d (red). Right panel: residual of the light curve shown in the left panel with the running mean subtracted. Periods of interest for spectral stacking are marked with vertical stripes or lines (cf. Fig. 1).

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