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MC-simulated beam profiles for a 3-cm diameter 6 MV [(a) and (b)] and a 5-cm diamter 15 MV [(c) and (d)] beams for open field (solid thin line), the X6-1 probe in horizontal (dashed-dotted line) and vertical (dashed line) orientation, and for the C5-2 probe in horizontal orientation (thick solid line). In horizontal orientation, the beam was incident on the most attenuating part of the probe at the distal tip.
