Figure 2.

Box and whisker plots of the multileaf collimator error of Sliding Gap QA (10 mm/s) performed at cardinal gantry angles. The error (mm) for sliding gap QA delivered at four different gantry angles on iX-2 for (a) bank A, and (b) bank B. Leaves moved with velocity 10 mm/s. The box and whisker plot represents the data as follows: The top line (or whisker) is the maximum value, the next line is the 3^rd quartile, the red line is the median, the next line is the 1^st quartile, and the last line is the minimum value. The red crosses are outliers