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. 2016 Feb 22;6:21667. doi: 10.1038/srep21667

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Left panel shows transfer functions across the coil as a function of frequency. The panel displays three curves, from two volunteers wearing the coils and a measurement in air. The resonance frequencies are evident. (The max amplitude of the 3 measurements was normalized to 1). Right panel shows the system measurement across the coils in air as a function of time.