200-day running FTs of the whole data (upper panels) and FT (bottom panel) near two frequencies at 33.839 μHz and 48.182 μHz. Both running FT plots have the same width of 3.5 μHz. Side upper panels show amplitude changes during Q 5−Q 17. Thick dashed lines in the amplitude panels mark the 4σ detection threshold applied in this work (0.01743 ppt), while continuous lines denote the maximum amplitude of background noise near both frequencies. In the bottom panel the dotted line (below the solid one) shows the local detection threshold (0.01549 ppt).
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