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. Author manuscript; available in PMC: 2009 Oct 12.
Published in final edited form as: IEEE Trans Biomed Eng. 2009 Jun 2;56(9):2181–2189. doi: 10.1109/TBME.2009.2024087

Fig. 3.

Fig. 3

Sample MENG recordings from 16 sensors. Vertical scale bar: 7.1 pT. Horizontal scale bar: 60 sec. Although we analyzed 120-second segments of data, a 60-second recording is shown here for clarity. The large oscillation (26 cpm, ≈ 2–7 pT) that dominates on most sensors is due to respiration of the test subject. Slow drift is also noticeable in many of the sensors. The large spike at t = 24 sec is probably due to a transient external signal, such as a metal door opening outside the laboratory.