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\section{Material and methods}  In the experimental setup, pictured in Figure \ref{Figure1}-(B), the electrical current was induced by a TMS device using a 2x75 mm diameter butterfly coil (MagPro R100 device with C-B60 Butterfly coil, MagVenture, Farum, Danemark). The coil was placed 1 cm away from the medium, without any contact, and fixed to an independent support. The electrical current in the coil was in "monophasic" mode, i.e., a half cycle of 0.4 ms, as illustrated in Figure \ref{InducedElectricalCurrent}. Alternatively, "biphasic" mode, i.e., a full sinus cycle of 0.4 ms could be used. According to the manufacturer's specifications, at 100\% amplitude, current reached a magnitude of 149.10$^6$ A.s$^{-1}$ in the coil, leading to a peak transient  magnetic field of 2 T at the surface of the coil and of 0.74 T at 20 mm in depth. The magnetic field was induced by a 5x5x5 cm$^3$ N48 NdFeB magnet (model BY0Y0Y0, K\&J Magnetics, Pipersville, PA, USA). The magnet was placed 1 cm away from the medium, without any contact, and fixed to a second independent support. The magnetic field intensity ranged from 100 to 200 mT at the medium location, as measured by a gaussmeter (Model GM2, AlphaLab, Salt Lake City, UT, USA).