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Noise limit value (%) (left) and LLE (right) for both types of coupling during ACV, IPS, and USB (from top to bottom). During ACV and IPS, coupling with expiration exhibits a higher complexity (noise limit value and LLE) than coupling with inspiration. The boxes encompass the interquartile range with indication of the median; the whiskers delimit the 95th percentile of the data distribution (t-test).
