876174.fig.003a
(a)
876174.fig.003b
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876174.fig.003c
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876174.fig.003d
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876174.fig.003e
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876174.fig.003f
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876174.fig.003g
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876174.fig.003h
(h)
Figure 3: Fourier power spectral density (PSD) (vertical component) calculated over the time span 10:00–15:00 UTC at the 8 sensors for which time series examples have been shown in Figure 3.