Interhemispheric Connectivity

Hi!
I tried it but it did not work:

I selected the same file (imported raw) on both sides, then I click run --> Processes --> Connectivity --> Amplitude Envelope Correlation (AEC) AxB but then I had just one electrode to compute AEC 1x19. What I want to compute is interhemispheric AEC (I mean between electrode pairs: O1 with O2, T4 with T3, etc).

I know that if I compute NxN AEC I will get these values too, but I don't want a big connectivity matrix cause many variables can affect results and give no significant results, I would like to get a connectivity matrix with just interhemispheric electrode pairs, is that possible?

Thanks!