Fig. 3

a Fitted line showing helix angle (HA) gradient calculated between 20 and 80% depth in biventricular dextro-tranposition of the great arteries (D-TGA) with and without ventricular septal defect (VSD). b Boxplot for D-TGA without VSD (n = 3). c Boxplot for D-TGA with VSD (n = 5). Middle line corresponds to the mean HA while outer dash lines are the 95% confident interval of the mean HA. a (b, n = 3) and with (c, n = 5). The Boxplot represents all HA values at each percentage of depth with the HA median as the red line, the first quartiles are the boxes and the dashed lines are the whiskers. The maximum whisker length is the interquartile range. HA values beyond the whiskers are displayed using “+”