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DVH bands for dose distributions covering all setup and proton range uncertainties for CTV and various organs for the robustly optimized plan (right column) and the PTV-based plan (left) for the base-of-skull case. As for the lung case, the solid lines are DVHs for the nominal dose distribution, and it is apparent that the CTV coverage for the robustly optimized plans is less sensitive to uncertainties and the normal tissue sparing is improved.
