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Fig. 1A —Box-and-whisker plots show median (middle line of box), quartiles (top and bottom lines of box), upper extreme value (upper whisker), and lower extreme value (lower whisker) for aortic arrival time and 100-H threshold time. Both aortic arrival time (A) and 100-H threshold time (B) showed smaller variation in group 2, but range was substantially large in all groups. Mean aortic arrival times and 100-H threshold times were comparable for all groups. Values above horizontal lines are p values for each comparison of mean values.