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Images of a single loop at very low-driving voltages. The voltage of the audio-frequency currents are approximately (A) 4.74 μV and (B) 2.38 μV, with estimated field strengths at the center of the loop of (A) 0.92 nT and (B) 0.46 nT. Images were taken with νcurrent = 100 Hz, τsl = 160 ms, and eight averages. Voxel magnitude is displayed as percentage saturation with respect to a control.
