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Comparison of an in‐air lateral dose profile of a proton beam of 90.1 MeV at the isocenter, with a range shifter of 4.5 g/cm2 placed 42.5 cm upstream from the isocenter: (a) linear scale; (b) semi‐log scale (Monte Carlo calculated profile, blue; diode measurement, red). 8 × 107 protons is used in the simulation.
