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Fig. 3

image

Amplitude spectrum of the hipparcos light curve of HD 2905, where the dominant frequency peak (f1 ) is also indicated. The right inset represents the spectral window. The left inset is a zoom of the amplitude spectrum showing two subsequent levels of prewhitening and the only additional reliable frequency peak (f2 ) standing out above four times the average noise level, indicated by the horizontal red dashed line (see text for details).

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