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Fig. 6

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Top panel: LSD I profiles (black solid lines) of individual subexposures obtained using the mask with all but He lines and the average profile (dashed red line, see text). Bottom: dynamical plot of the residuals of the profiles relative to the mean profile, folded in phase with P = 0.0929 d. The vertical dashed lines indicate  ± 4.112 km s-1 centred on 3.8325 km s-1 and correspond to the excursion domain of the centre of the line.

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