Figure 2.

Differences between the accumulated V99s of the 4D treatments and the nominal V99s of the static plans. The box plots are displayed with red lines representing the median values; the top and bottom of each box representing the third and first quartiles, respectively; and the whiskers at the ends of the lines extending from the boxes representing the maximum and minimum, respectively (if there are no suspected outliers) or the positions corresponding to 1.5 times the difference between the third and first quartiles (the interquartile range) away from the box (if there are outliers). The red plus symbols represent potential outliers.