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Example fdTMS coil designs. (a) Spherical coil surface with radius 9 cm and concentric with the spherical head model. (b) Half-sphere surface coil with radius 9 cm. (c) 32 × 32 cm square coil surface centered 5 mm above the apex of the spherical head model. (d) 32 × 32 cm square coil centered 5 mm above the scalp over the brain target.
