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a) Example of potential measured in P1 and P2 versus distance r in normalized units. One notes the strong similitude between P1 and P2 when r is large in comparison with the distance shift ε of the two electrodes. Also, we oberve a strong amplitude difference between potential P1 and P2 when the current source is close to the electrodes pair (zoom in figure). b) Recording methods and electrodes location during the experiment.
