whitened evoked response and whitened GFP

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Hi,

Please I would like to know what the whitened evoked response and whitened GFP plots show and what is signifies.

I read this on the page " The numbers in the GFP panel represent the estimated rank of the data, which amounts to the effective degrees of freedom by which the squared sum across sensors is divided when computing the whitened GFP." I don’t understand that statement.

See link Computing a covariance matrix — MNE 1.6.1 documentation

An explanation would go a long way for me to understand the two plots.

Thanks