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Figure 4: Comparison of depth dose distribution of rectangular field 4 × 2 cm and equivalent circular field R = 1.4 cm and equivalent square field 2.5 × 2.5 cm at 15 MeV

Figure 4: Comparison of depth dose distribution of rectangular field 4 × 2 cm and equivalent circular field R = 1.4 cm and equivalent square field 2.5 × 2.5 cm at 15 MeV