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Output factors of 4 × 4, 6 × 6, 8 × 8, 10 × 10, 12 × 12, and 15 × 15 cm2 fields for all photon energies (6 MV, 10 MV, and 15 MV WFF, 6 MV and 10 MV FFF) measured with EPID and an ion chamber. The ion chamber measurement depth is 1.5 cm for 6 MV and 6 MV FFF, 2.5 cm for 10 MV and 10 MV FFF, 3.0 cm for 15 MV.
