Hello Francois,
sorry after running the data we are still a little confused.
So when I was running the data as average I got the following warnings. Based on your comment on the time windows I assumed that concatenate should be the appropriate choice
But comparing the two results it feels like the averaged data look a little more complete. The next figure present first the results for concatenate then for average.
What is concerning for concatenate is not only the amount of 0 values but also the considerable differences in amplitude. Most value are arround 0,001 while for average it is 0,1.
I know that source coherence might be different than channel coherence but from channel coherence data I would expect results to be more in the range of 0.1 which is similar to the results we got for averaging. This makes me also concerened that maybe averaging would have been the better solution.
The question is pretty simple, just based on this more detailed view of the data and the warning. Would averaging or concatenate be more appropriate.
Thanks!