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\section{Results}  Z component maps of the displacements over time are illustrated in Figure \ref{Figure4}, respectively 1, 2, 4, 8 and 12 ms after current emission, as given by the simulation (A), experiment in the PVA phantom (B) and experiment in the chicken breast sample (C). Initial displacements were close to the Lorentz force excitation location, on the opposite side of the ultrasound probe. They reached an amplitude of 5 $\mu$m in the phantom and 0.5 $\mu$m in the chicken sample. They propagated as shear waves, whose speed was 4.0 m.s$^{-1}$ for the simulation, 4.0$\pm$1.0 m.s$^{-1}$ for the PVA phantom and 6.5$\pm$1.5 m.s$^{-1}$ for the chicken breast along Z axis. Displacement maps were harder to compute in the chicken breast sample: electrical conductivity was 3 three  times lower, giving resulting in  lower displacements; speckle was of poor quality, giving the grain-like appearance on the results; and the sample presented inhomogeneities (muscle fibers, arteries, etc). When TMS coil was used in "biphasic" mode, no displacement could be observed.