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(a) Attenuation rate of induced EF in the figure-8 coil, the 36-coil planar array, and the 36-coil cap-formed array. (b) Corresponding ranges of activated depth with different coil types. (c) The focality of various coils with optimal energizing strategies. (d) The attenuation rates of the figure-8 coil, the planar array, and the cap-formed array with optimal energizing strategies.
