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Fig. 3. Breathing pattern (flow and volume) and abdominal motion in newborn tammar wallabies at 1 and 6 days of age. At the end of inspiration, the respiratory muscles are contracting (active), whereas they are relaxed (passive) during the end-inspiratory pause. The distortion index is calculated from the degree of abdominal displacement (
A) during active and passive conditions, 1(
Ap/
Aa), with a value of 1 implying maximum distortion and a value of 0 no distortion.
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