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Rectum dose-volume constraints: old clinically applied values (Sacral chordoma—open square; prostate AdC—open circle), LEM-translated (Sacral chordoma—full square; prostate AdC full circle), new clinically defined (full diamond), MedAustron optimal (open triangle), MedAustron acceptable (full triangle), Heidelberg Ion-Beam Therapy Center (HIT) (cross).
