Figure 6.
Comparison of the (a, d, g) time series, (b, e, h) frequency spectrum of trace, and (b, e, h) zoom in on the frequency spectrum of the trace 0–20 Hz at a (a)–(c) 20 Hz, (d)–(f) 30 Hz, and (g)–(i) 40 Hz.

Comparison of the (a, d, g) time series, (b, e, h) frequency spectrum of trace, and (b, e, h) zoom in on the frequency spectrum of the trace 0–20 Hz at a (a)–(c) 20 Hz, (d)–(f) 30 Hz, and (g)–(i) 40 Hz.

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