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Relative values of apparent diffusion coefficient (ADC*) and end-inspiratory lung volume (EILV*) expressed as a fraction of their baseline values at positive end-expiratory pressure (PEEP) 0 cm H2O (ascending ramp) and plotted versus each other at each level of ascending and descending PEEP. EILV and ADC were obtained in different groups of animals at matching experimental conditions. Error bars indicate SD for ADC (vertical bars) and for EILV (horizontal bars).
