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(a) Common mode signal across 16 channels – averaging across 16 channels removes spikes from the signal. (b) Common mode signal of 9 channels with clear MUA – even if all channels used for averaging have MUA, the spikes will be removed so long as enough channels are averaged. In general, all available channels should be included to isolate common mode noise and artifacts from MUA. (c) MUA from a single channel for comparison.
