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Fig. 3

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Amplitude spectrum at different steps of the frequency search process: a) original spectrum, b), c), d), e) show the spectrum after subtracting 4, 25, 55 and 115 peaks, respectively. In panel e) the significance level is also given by continuous line. Panel f) shows the fine structure of the spectral window, where its y-axis is normalised to unity instead of mag.

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