Bipolar VEOG and HEOG blink artefact removal

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Hello,

the way this is usually treated is that you combine the channels by subtraction, such that:

VEOG = VEOG_lower - VEOG_upper
HEOG = HEOG_left - HEOG_right

You would roughly do something like the following:

veog_ch_name = 'VEOG'  # the new channel that will be created

mne.set_bipolar_reference(
    inst=raw,
    anode='VEOG_lower',
    cathode='VEOG_upper',
    ch_name=veog_ch_name,
    drop_refs=True,  # drop anode and cathode from the data
    copy=False  # modify in-place
)

If not both input channels were already of type eog, you need to set the type of the created channel accordingly, too:

raw.set_channel_types({veog_ch_name: 'eog'})
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