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Fig. 7


Time series of the oscillations S1 and S2 (left), detrended oscillations with fittings in red (centre), and associated wavelet power spectra (right). The period is between 3.7 and 4 min. There is a very small variation of the period from the fitting analysis, however the green lines in the wavelet power spectra have a null slope.

This figure is made of several images, please see below:

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