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Fig. 4


Top panel: 200 days running FT of the whole data near 3431.8383 and 3447.2453 μHz showing amplitude and phase changes of the two p-modes. Both running FT plots have the same width of 3.5 μHz. The two bottom panels show the ordinary FT of the same frequency regions: all data FT (the first panel on the left) and FT of season 1,2,3,4 data (next four panels on the right). Amplitudes were normalized by the largest amplitude of all seasons.

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