Comparison of CTV D95% (CTV, clinical target volume; D95%, the minimum normalized dose that covers 95% of the region of interest with the highest dose of plans A, B, and C with realistic (small) minimum MU constraint and artificially 10 times larger (large) minimum MU constraint, in all seven patients. Error bars indicate the DVH family bandwidth at D95%, which indicates plan robustness. [Color figure can be viewed at wileyonlinelibrary.com]