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Figure 1: Shows HN phantom with two isocentric, coplanar 6 MV photon beams. The fi eld size was 10 10 cm2 and the beams were placed anteriorposterior (AP) and posterior-anterior (PA)

Figure 1: Shows HN phantom with two isocentric, coplanar 6 MV photon beams. The fi eld size was 10  10 cm2 and the beams were placed anteriorposterior (AP) and posterior-anterior (PA)