deletions | additions       diff --git a/Displacement_amplitu.tex b/Displacement_amplitu.tex  index 7633683..21df051 100644  --- a/Displacement_amplitu.tex  +++ b/Displacement_amplitu.tex 
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Displacement amplitude maps along Y axis and Z axis 0.8, 1.6, 2.4, 3.2 and 4.0 ms after laser emission in the phantom are illustrated in Figure \ref{Figure2}. A typical shear wave pattern can be recognized: dissymetry for Y-displacement, symmetry for Z-displacement \cite{undefined}. Displacement reached an amplitude of 3 $\mu$m. Displacement propagated at a velocity of 4.5$\pm$0.5 m.s$^{-1}$, which is a typical value for shear wave, and far lower than usual compression wave velocity, about 1500 m.s$^{-1}$ in soft solids. Supposing the medium density $\rho$ of 1000 kg.m$^{-3}$, it corresponds to a shear modulus of 20 kPa, which is in the range of the expected value of the phantom. Over ten experiments,the frequency of the  shear wave frequency  was equal to 500 $\pm$ 50 Hz. However, it is not known at this stage if the shear waves are due to thermal stress or ablation, especially as the used power is close to the transition between the two regimes in metals. 
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