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Fig. 3
Periodogram of the line center variation as shown in Fig. 2, without prewithening. The large bulk of frequencies around 29-36 d-1can be seen, as well as the 3.2, 3.6 and 4.0 mean-ampitude level of the noise determined by prewithening F1 to F9, corresponding to a 90%, 99% and 99.9% significance level, respectively.
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