Ok, I get the problem.
The values are the average connectivity matrix data obtained with a previous code. It represent the connectivity between each channel (61x61) but mne takes the number 60 as a timecode.
I’d like to re-implant this new matrix in mne to be able to analyze the data and get this kind of figure :
So the most logical and simple way would be to not need to create epochs, but if I don’t create any, I get an error message asking for them.