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EEG channel power spectral density envelopes (max and min channel spectra): before artifact removal (dashed line), after performing channel-based artifact removal (dash-dot line), and after performing IC-based artifact removal for a representative subject (A) walking at 0.8 m/s, (B) walking at 1.25 m/s, and (C) running at 1.9 m/s (solid line). Gray vertical lines indicate the mean step frequency in each condition.
