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(a), (b), (c): Results for configuration n°3 (f = 25 kHz, perpendicular to the water flow, PUS = 105 W + f = 2 MHz, collinear, PUS = 105 W) // (d), (e), (f): Results for configuration n°6 (f = 2 MHz, perpendicular to the water flow, PUS = 105 W + f = 25 kHz, collinear, PUS = 105 W).
