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RBE volume histograms comparing differences between (α/β)x = 2.1, 2.5, and 3.3 Gy for the brainstem. For reference, the median LETd and dose from RBE1.1 in the brainstem for each patient are shown in the boxes in the bottom left corner. Abbreviations: CAR = Carabe; LETd = dose-averaged linear energy transfer; MCN = McNamara; RBE = relative biological effectiveness; ROR = Rørvik; WED = Wedenberg.
