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. Author manuscript; available in PMC: 2015 Feb 1.
Published in final edited form as: Neuroimage. 2013 Oct 24;86:446–460. doi: 10.1016/j.neuroimage.2013.10.027

Figure 2.

Figure 2

Average power spectral density (PSD) of gradiometer channels estimated with Welch’s method (Welch, 1967). The red region shows one standard deviation. One can clearly see the power line artifacts at 60, 120 and 180 Hz, that MNE can suppress with notch filters.