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Fig. 17


Marginal distributions of the frequency for all the nine spots. The frequency values group around the two principal frequencies (0.391 and 0.414 d-1) seen already in the Fourier spectrum (Fig. 7), which is the reason for the obvious “beating” phenomenon in Fig. 15 with a period of 40 days. The shortest and the longest frequency are a superposition of two frequencies.

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