Fig. 2.

Comparison of rectal volume on CBCT scan (box plot) with planning CT scan (red cross). The box represents the 25th and 75th percentiles, with the central line showing the median value. Two lines extending from the central box of maximal length 3/2 the interquartile range but not extending past the range of the data. Outliers are points that lie outside the extent of the previous elements.