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Distributions of acinar peak volumetric strain (εV) for dual-frequency waveforms constructed according to Eq. 17 using 0 ≤ β ≤ 1 to scale the contribution of each frequency, using oscillations at either 0.3 and 12 Hz (A) or 12 and 26 Hz (B). Distributions are represented by the median (solid line) and full range between minimum and maximum value (shaded region). Normalized distributions are shown with the mean value normalized to unity (dotted line).
