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Z-weighted equivalent continuous sound pressure levels time-averaged over 0.64 s Lp,Z,eq 0.64 s of the one-third octave band with a center frequency of 20 kHz in a horizontal plane 24 cm to 99 cm in front of the sonotrode at a height of 1.11 m (SFigure 9: z = −1.26 m) with a spatial resolution of 0.6 mm.
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