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Figure 3: Measured percentage variations in measured ratios of ionizations at two reference depths in perspex phantom a) 6 MV X-rays from Clinac 600 CD b) 6 MV X-rays from Clinac 2300 CD c) 15 MV X-rays from Clinac 2300 CD and d) 15 MeV electrons from Clinac 2300 CD

Figure 3: Measured percentage variations in measured ratios of ionizations at two reference depths in perspex phantom a) 6 MV X-rays from Clinac 600 CD b) 6 MV X-rays from Clinac 2300 CD c) 15 MV X-rays from Clinac 2300 CD and d) 15 MeV electrons from Clinac 2300 CD