Fig. E.4
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Normalisation effect on the Na I D1 line profile for spectra taken at two different phases, (a) The normalisation is obtained by dividing each spectrum by its mean over a 100 Å window. This procedure is incorrect (see text), (b) The normalisation between the two spectra takes into account the relative flux ratio of 0.33 between the two phases corresponding to a drop of 1.31 mag. The RV zero point is set to λ = 5895.92 Å.
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