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Pressure reflection coefficients vs frequency for deflated pig lungs (◆) and inflated lungs at 5 cm H2O (◼), 10 cm H2O (▲), and 15 cm H2O (×). The measurements were taken from (a) 7–8-week-old pigs, (b) 4–5-week-old pigs, and (c) 1-week-old pigs. The error bars represent one standard error.
