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Fig. 3. —Box plot of distribution of signal of flow in three hepatic veins revealed by Doppler sonography by percentile for age categories. ({blacksquare}) = right hepatic vein, ({blacktriangleup}) = middle hepatic vein, ({diamondsuit}) = left hepatic vein. Distribution of flow patterns of each hepatic vein around median value is indicated by bars for children in 25th and 75th percentiles and by whiskers for children in 10th and 90th percentiles. Note that monophasic flow is much more common in neonates.