Fig. 13
Top: an LS periodogram (in frequency domain) of the ETVs of the S3 curve. Five most prominent frequencies are marked. They were also detected by FREDEC. Bottom: the ETVs (red points) phase-folded with the period corresponding to the highest peak of the periodogram. The best-fitting sine function is plotted over (blue line). The data are repeated at phases <0.0 and >1.0 for clarity.
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