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\subsection {Neuronal contribution into LFP}  According to \cite{Chizhov_2015}, the LFP at the somatic level, $\varphi_N(t)$, is determined by the  neuronal membrane voltage distribution and the firing activity as follows: \begin{equation} \label{e1}  \varphi_N (t)=\frac{p}{2\, \sigma \, r_{i} }