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Current distributions at 1 (A), 2 (B) and 3 (C) cm inter-needle distances.
The curves represent the electric field lines at different needle distances in the forearm model; the arrows indicate the direction of current. The figure C shows that smaller arrows indicate decreased current density. However, arrow number and depth increase. Besides, it has more homogeneous distribution of current and more electric field lines parallel to the nerve compared with the A and B.
