Fig. 6.
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Top row: residual Balmer line and He I line profiles. The different colors correspond to successive rotational cycles. Bottom row: 2D periodograms of residual Balmer line and He I line profiles. Light yellow represents the highest power of the periodogram. Bottom panel: mean residual line profile (black) and its variance (blue). The dashed-dotted line indicates the rotational period of the star.
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