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Axial distributions of dimensionless peak positive and negative pressures (a) and intensity (b) in nonlinear focused beams in tissue (solid curves) and in water (dashed curves). The pressures and intensity are normalized to the source values in water. Linear focusing gain G = 40, nonlinearity N = 0.25, absorption in tissue At = 1. Shown in small frames are focal waveforms (a) and their spectra for the first six harmonics (b).
