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A transversal view of proton beams arrangement for the prostate treatment plan (case #4) in the XiO treatment planning system. The figure shows three fields: left anterior–oblique (LAO) with gantry angle 30° and couch angle 180° (left panel), right anterior–oblique (RAO) with gantry angle 30° and couch angle 0° (middle panel), and right lateral (RL) with gantry angle 90° and couch angle 0° (right panel).
