Get channel type.
str
Type of channel. Will be one of:
{'grad', 'mag', 'eeg', 'csd', 'stim', 'eog', 'emg', 'ecg',
'ref_meg', 'resp', 'exci', 'ias', 'syst', 'misc', 'seeg', 'dbs',
'bio', 'chpi', 'dipole', 'gof', 'ecog', 'hbo', 'hbr'}
mne.channel_type
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