[Mne_analysis] which type of refence eletrode is used in MNE sample data (EEG)

[junpeng.zhang at gmail.com]

Dear MNE users, 
I also had a question related to the EEG processing. 
Which reference eletrode is originally used in the EEG included in sample data?

Thank you in advance. 

Junpeng 
“海纳百川 有容乃大”
“Live as you are dying, and never stop trying”
 
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