Fig. 2From: Diaphragm echodensity in mechanically ventilated patients: a description of technique and outcomesEvolution of diaphragm echodensity according to the duration of mechanical ventilation. Thin curves represent the evolution of diaphragm echodensity in each individual. Thick curves with error-bars represent mean and standard error of the mean of the diaphragm echodensity according to the groupsBack to article page