Top panel: transmission spectra of the three individual transits in the planetary rest frame. The He I triplet is indicated by vertical lines. In parentheses we provide the weights for computing the weighted mean absorption profile. For comparison, a smoothed version of the mean absorption profile is given by the black solid line. For a discussion, see Sects. 3.3 and 3.4. Bottom panel: same as Fig. 5, but for the He I λ 10829 Å line.