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Gamma maps comparing extended dose range (EDR2) film and an electronic portal imaging device (EPID) (a1–a4) before correction, and (b1–b4) after correction with 2% and 2.5 mm criteria, and gamma maps comparing the treatment planning system and an EPID (c1–c4) before correction, and (d1–d4) after correction with 3% and 2.5 mm criteria, for phantom thicknesses of 7, 17, 20, and 30 cm respectively
