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The average standard deviations (SD avg) of the waves “a”, “b”, “c”, “d”, and “e” on the time domain at different edge frequencies for 21 healthy subjects. (a) standard deviation of wave “a” at different edge frequencies; (b) standard deviation of wave “b” at different edge frequencies; (c) standard deviation of wave “c” at different edge frequencies; (d) standard deviation of wave “d” at different edge frequencies; (e) standard deviation of wave “e” at different edge frequencies.
