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Fig. 5
The phases for each Fourier component over the 9 days of observation after filtering the signals to contain only periods in the range P = 50 − 150 min. Phases are given in degrees and the points for each day lie on an annulus at r = 1,2,...,9, corresponding to the day number (i.e. 1 for 06 April 2003, 2 for 07 April, etc.).
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