General question about averaging


Could someone refer me to any source or explain me how the averaging works
in MEG?
I understand that the location of the sources are unique for each subject,
and so sensor data can't be averaged. I wonder how it works with the source
data. Can they be averaged across subjects or is there an extra step as to
make each source data point in the same space coordinate for all subjects?

Thank you,
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I invite you to read:

in particular the paragraph on "Surface-based normalization"

you have a pdf here:

or section 2.5 in

you can also look at:
that comes with code you can read.