Time series of μ(v) profiles of C IV computed from the spectra of images A and B with respect to the 2018 spectrum of image B, unaffected by microlensing (top). Same profiles are shown below, but normalized by the factor, f_n, defined in the text. The color-coding of the profiles and the error bars are the same as in Fig. 4. The A/B2018 μ(v) profiles are not affected by microlensing in B, while the B/B2018 μ(v) profiles are not affected by microlensing in A. The normalized A/B2018 μ(v) profiles have similar shapes at the different epochs.