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Table 2: Req for rectangle fi eld sizes, E=6 MeV and σ2 =0.38 (radian2 cm2). 2a and 2b (cm) are the sides of rectangle

Table 2: Req for rectangle fi eld sizes, E=6 MeV and σ<sup>2</sup> =0.38 (radian<sup>2</sup> cm<sup>2</sup>). 2a and 2b (cm) are the sides of rectangle