This article has an erratum: [https://doi.org/10.1051/0004-6361/201117721e]
The sequence of Na I D line variations for JD 55 667, 55 675, 55 688, 55 697, 55 703, and 55 712 (from bottom to top). Only He I 5875 Å is present in the first (JD 55 667, bottom) spectrum. The progressive displacement of the DACs, with the doublet. The spectrum from JD 55 690 is not included because of the lower signal-to-noise ratio (see text).
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