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\label{Figure3}(A) Amplitude of the shear wave versus laser beam power. A linear dependence is observed (R$^2$ = 0.9745), with a threshold at low amplitude due to ambient noise. 0.9745) between 50 and 200 mJ.  (B) Amplitude of the shear wave versus black disk diameter. A linear dependence is observed (R$^2$ = 0.9281).