I have two simultaneously recorded MEG and HD-EEG recordings and I successfully combine them in MNE software using the triggers that are sent to both machines via trigger box. The combined .fif file looks correct but I seem to have an issue when I try to display the MRI registration in the brainstorm software. The MEG registration in the combined .fif file matches with the single MEG recording but EEG registration looks like it’s shifted when I compare it with the single EEG file(.mff) I suspect this is due to the fact that EEG and MEG use different coordinate systems. Is there a way to fix this issue in MNE? Any ideas are very much appreciated! Thank you!