[Mne_analysis] notch filter for removing power chord signal

[Denis-Alexander Engemann]

Dear list,

I wonder whether there is a MNE-way of removing power-chor artifacts
from wide-band MEG data (1-200 Hz).
As there does not seem to be a notch filter available, empty room SSPs
might be the way to do it.

What do you think?

Denis


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