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Table 1: Beam widths and penumbras in X direction in the transverse plane for the four helmets measured with film and the PinPoint ion chamber. Beam width at 50% isodose line, penumbra from 20% to 82% isodose line

Table 1: Beam widths and penumbras in X direction in the transverse plane for the four helmets measured with film and the PinPoint ion chamber. Beam width at 50% isodose line, penumbra from 20% to 82% isodose line