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The internetwork synchronization. Similar to intranetwork correlation, systematic modulation of internetwork correlation is shown at the fundamental frequency (B), the first harmonic (D), and full frequency band (F) rather than other frequency bands (A: 0.01–0.097 Hz; C: 0.103–0.197 Hz; E: 0.203–0.25 Hz). ***P < 0.005. Error bar shows the 95% confidence interval.
