Re-reference offiline

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Dear all,

I am using MNE Python to analyse an EEG dataset with 32 channels. The online reference is the left mastoid and I need to re-reference my data to the average of the mastoids. However, being the left mastoid the reference, brain vision does not read it as a channel. Is there an automatic method on MNE python that calculates the value of the left mastoid so that I can re-reference my data to ['RM','LM']?

Thank you for your help,

Chiara
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https://mne.tools/stable/generated/mne.add_reference_channels.html

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Additionally, there is a worked example of your situation in the following tutorial section:
https://mne.tools/stable/auto_tutorials/preprocessing/plot_55_setting_eeg_reference.html#setting-or-changing-the-reference-channel

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