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Ability to steer the stimulated area by changing the voltage ratio of the coils, without changing their mechanical locations. The arrangement of the coils is as in Fig. 4(e) but; (a) Vcoil(I): Vcoil(II) = 2:1 (keeping the sum at 1.5 kV), (b) Vcoil(I): Vcoil(II) = 4:1 (keeping the sum at 1.5 kV).
