Cross correlation function (normalized to peak intensity) of F2/F1 with F1 in the case of a time-lagged BLR (thin blue line) and of a non-variable BLR (dashed black). The third curve (thick solid black line) shows the CCF between the fraction of the quasar flux affected by (free of) microlensing FMμ (FM), as obtained by linearly combining F1 and F2 (Sect. 2.4, Eq. (5)). The dotted-dashed vertical line shows the fiducial time lag τ = 100 days between the variation of the continuum and of the BLR in the simulation.
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