Empty room SSP vs. Maxwell filtering

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Dear Alex and Denis,
Could you tell us what is the importance of removing the empty room noise
component using SSP? Wouldn't the maxwell filtering remove the empty room
noise component by default?

Thanks in advance,
Harish

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Well I guess you're asking why one should process the empty room recording
like one processes the data?
You simply want to make sure the rank of the data is the same and the only
difference is in the content of the signal, not the processing applied.

Does that make sense?
Denis