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Percent differences between calculated (by both SG and DG fluence models) and measured doses at the center of the field and SOBP (4 cm) as a function of field size for three different proton ranges, 10.5, 20.0, and 30.6 cm. Positive values represent calculated doses larger than measured ones. (a) SG fluence model; (b) DG-EFP; and (c) DG fluence model with empirical parameters.
