Fig. 7.
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LiI 6707 Å line profile. Left: the 34 line profile measurements from SOPHIE spectra are shown superimposed. The color code corresponds to successive rotational cycles. Right: 2D periodogram across the line profile. The dotted horizontal line drawn at a frequency of 0.166 day−1 indicates the stellar rotational period. The white curve displays the mean line profile. The color code reflects the periodogram power.
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