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Figure 2 :In-plane air fl uence profi les measured for rectangular fi elds at two different distances from the source of the beam (85 and 105 cm) for electron beams energies of (a) 6, (b) 12, and (c) 20 MeV, and fi eld sizes of 8 8 cm2, 20 8 cm2, and 35 8 cm2

Figure 2 :In-plane air fl uence profi les measured for rectangular fi elds at two different distances from the source of the beam (85 and 105 cm) for electron beams energies of (a) 6, (b) 12, and (c) 20 MeV, and fi eld sizes of 8  8 cm2, 20  8 cm2, and 35  8 cm2