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Table 1

Mean periods and ratios of the modal standard deviation, σm to the original signal standard deviation, σ0 of the empirical modes detected with EMD in the average magnetic field signal shown in Fig. 1, right-hand panel.

Period (min) σm/σ0 Period (min) σm/σ0

M1 2.3 0.13 M6 36.3 0.14
M2 4.0 0.09 M7 74.3 0.14
M3 6.4 0.07 M8 120.0 0.31
M4 10.6 0.07 M9 156.0 0.08
M5 17.9 0.07 M10 312.0 0.10

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