[QUOTE=Francois;6134]Then you just need to subtract the values of E2 from your signals.
Example of electrode F1:
What is currently saved in the file is currently (F1-E1), because E1 was your initial reference.
If you calculate (F1-E2), it would be in implicitly (F1-E1-E2) = (F1-(E1+E2))
This is your joint reference E1+E2
Francois[/QUOTE]
[B]Should i dont use (F1-(E1+E2)/2) …I mean average of E1 and E2 ? [/B]