[Mne_analysis] Conductivity 1 layer or 3

[Andrade Rey René]

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Dear experts:

There is an issue I don´t know how to proceed with. I am trying to do forward solution and I need  to have made BEM model for which I need to introduce conductivity defined for 1 or 3 layers. If I do 3 the output is an error if I choose 1 layer the output in forward solution is an error pointing to 3 layers in BEM model. What can I do?

Sincerely, 
Andrade.