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Figure \ref{Comparaison}-(E-F) illustrates Z-component map 8 milliseconds after excitation, in a 5 S.m$^{-1}$ medium and a 1.8 S.m$^{-1}$ medium respectively (note that (E) and (A) are identical). Average displacement in the region of interest is equal to 3.3 $\mu$m in the first case and 1.4 $\mu$m in the second case: when electrical conductivity of the medium decreases, shear wave amplitude decreases roughly by a same factor.  Figure \ref{Comparaison}-(G-H) illustrates Z-component map 7 milliseconds after excitation, when excited with a 100\% and a -100\% amplitude in the coil respectively. Average displacement in the region of interest is equal to 1.3 2.6  $\mu$m in the first case and -1.4 -2.8  $\mu$m in the second case: displacement amplitude is inverted when excitation is inverted.