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Parameterized relative biologically effective (RBE) values superimposed over spread-out Bragg peak dose-depth profiles for plateau doses of 3.6, 2.4, 1.8, and 0.8 Gy in acute (A) and fractionated (B) regimens. RBE values are calculated using equations (3), (4), (5) and X-ray data from Table E1 (available online at www.redjournal.org).
