Fig. B.1
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Top panel: example of LSD profiles for 17 Oct. (blue), and 23 Oct. (red) at close rotational phases (ϕ = 0.9768 and 0.9763). The small differences between the two profiles (e.g., at RV = −30 km s−1) are consistently observed in other couples and are mainly caused by latitudinal differential rotation. Bottom panel: difference between the two profiles.
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