Fig. 4
Comparison between the reference spectra in Visits 1 (blue), 2 (green), and 3 (red). The spectra for Visits 2 and 3 display no significant differences except for a localized feature around 200 km s-1. They are also similar to the core and the far wings of the Visit 1 reference spectrum, which shows however a 11 ± 2.7% flux increase in the shaded gray regions.
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