Hi Jeff,
Thank you for responding. It is indeed a CTF system.
Eventually, I changed the channel type to ‘grad’ because I had trouble when computing the adjacency matrix for cluster analysis. I got an error when the channel type was ‘mag’, so I changed the channels to ‘grad’, and then it worked.
Otherwise, just using them as ‘mag’ in MNE should work fine too.
Thanks again,
Kind regards,
Janne