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Pressure reflection coefficients vs frequency for deflated rabbit lungs (◆) and inflated lungs at 7 cm H2O (◼), 10 cm H2O (▲), and 15 cm H2O (×). The measurements were taken from (a) 5-yr-old rabbits, (b) 3-yr-old rabbits, and (c) 12-week-old rabbits. The error bars represent one standard error.
