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The glial contribution into LFP, $\varphi_G(t)$, can be approximated as follows:  \begin{equation} \label{e2}  \varphi_G(t)=k_G \big\[ [  {dK_e \over dt} \big\]_{Glia} ]_{Glia}  \end{equation}  \subsection {Cumulative LFP model}