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(A) Volumetric arc therapy versus (B) intensity-modulated proton therapy plans for a patient with cT3N0 anal cancer. Isodoses lines are displayed in color wash and represent the following doses: 56.7 Gy (pink), 54 Gy (red), 51.3 Gy (light blue), 43.2 Gy (yellow), 35.2 Gy (green), 27 Gy (teal), 10.8 Gy (dark blue).
