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(a) Fractional depth dose as a function of depth and field size at a constant for 6 MV photons, without a block tray in place. (b) Fractional depth dose as a function of depth and field size at a constant for 10 MV photons, without a block tray in place. (c) Fractional depth dose as a function of depth and field size at a constant for 18 MV photons, without a block tray in place.
