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Noisy raw MEG magnetometer signals corrupted by a) slow drifts, b) line noise (at 50 or 60 Hz), and c) heartbeats present across sensors. To clean signals data were filtered between 1 and 45 Hz. Subsequently, five signal space projection (SSP) vectors were applied (3 computed from empty room noise, 2 from ECG signals). The plots were generated using the plot method of the Raw class.
