Cleaning MEG/OPM data with SSP from empty

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Hi everyone,

Do you think is a good idea use mne.compute_proj_raw() as suggested in

https://mne.tools/stable/auto_tutorials/preprocessing/50_artifact_correction_ssp.html#sphx-glr-auto-tutorials-preprocessing-50-artifact-correction-ssp-py

for MEG/OPM data cleaning?

For this purpose I’m using an empty recording performed just after the subject recording. From literature in the same device they used n_mag=4 (there are only mag channels, not grad as in “normal” meg), for me it also has seemed a good option to remove enviromental noise since with n_mag=2 (or 3) is still possible to see some undesired peaks at the 20-30 band in the spectrum.

Best