[Mne_analysis] Epoch mode covariance estimation

[Kambiz Tavabi]

Hi all,
I wonder if someone could clarify a detail concerning the calculation of 
the covariance matrix in epoch mode when the KEEPSAMPLEMEAN option is 
specified.
On page 89 of the MNE manual (version 2.7.3) the formulation for the 
covariance matrix is unclear on the limit of the sum of samples (j). My 
question is whether the limit is the number of samples (Nr) in the 
entire epoch, or just the baseline/pre-stimulus period?

Thanks
Kambiz