* The calculated R2 for SA is given for the σL(E) with 5 discretization steps. The calculated R2 for models with σ being independent of E (σL = const. = 0.04593 S/m and σL = const. = 0.067 S/m) was negative.
The calculated goodness-of-fit measure R2 between numerical data obtained with nonlinear model (model with σL(E)) and in vivo data.