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Table 2a: Symmetry, flatness and penumbra for 6MeV electron beam for 10 × 10 cm2 and 6.5 × 9.0 cm2 field sizes Table 2b: Symmetry, flatness and penumbra for 20MeV electron beam for 10 × 10 cm2 and 6.5 × 9.0 cm2 field sizes Table 2c: Symmetry, flatness, and penumbra for 6MeV electron beam for 15 × 15 cm2 and 11.5 × 15.0 cm2 field sizes Table 2d: Symmetry, flatness, and penumbra for 20MeV electron beam for 15 × 15 cm2 and 11.5 × 15.0 cm2 field sizes 
