deletions | additions       diff --git a/The_two_regimes_have.tex b/The_two_regimes_have.tex  index 532c1d7..d07ab7d 100644  --- a/The_two_regimes_have.tex  +++ b/The_two_regimes_have.tex 
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The two regimes have a different initial displacement. two opposite displacements \cite{undefined}.  As previously described, the thermoelastic regime acts as local dipoles of force parallel to the surface. Thus, the medium stretches locally parallel to the surface, resulting two opposite displacements along X axis (parallel to the surface) and in an apparent displacement outside the medium along Z axis (normal to the surface). In the ablative regime, the point force in the medium displaces locally at the surface of the medium along Z axis, resulting in two weak opposite displacements along X axis. Initial displacement, as seen on on Z-displacement at $t$=0.8 ms in Figure \ref{Figure2}, is clearly negative, i.e., the displacement is inside the medium along Z axis, which is an indication of an ablative regime. Moreover, at high amplitude, at the impact location of the laser beam on the phantom, a disk of paler color of the same size as the beam diameter can be observed. Some of the material has probably been vaporized or melted. 
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Shear wave amplitude has been shown to be linearly dependent on laser beam power in thermoelastic and ablative regime, until plasma occurs at very high power (about 10$^9$ W.cm$^{-2}$ in metals) \cite{scruby1990laser}. The dependence of the generated shear waves on laser energy was then investigated by increasing the laser beam energy from 0.5 to 10 mJ.mm$^{-2}$. Results are illustrated in Figure \ref{Figure4}-(A). We observe an linear relationship between shear wave amplitude and laser beam power, with a correlation coefficient of 0.9386. At an energy smaller than 50 mJ, shear wave amplitude becomes however smaller than ambient noise. Due to this linear dependency, the plasma regime can be discarded.