Figure 3.

Electric potential ${\mathbf{u}}_d^{+}$ (a) and ${\mathbf{u}}_d^{\square }$ (c) along the paths of synthetic measurements, and the current source density ${\mathbf{f}}_{\alpha }^{+}$ (b) and ${\mathbf{f}}_{\alpha }^{\square }$ (d) reconstructed from the synthetic measured data.