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In-air lateral profiles for pencil beams with three different energies. Solid lines: MC; dots: measured data; dashed lines: calculated by SG fluence model; dashed-dotted lines: calculated by DG fluence model with empirical parameters; and dashed lines: calculated by DG-EFP. (a) 72.5, (b) 148.8, and (c) 221.8 MeV.
