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Figure 2: Percent depth dose values for 6MV photon beam calculated by Monte Carlo code versus measurement data (source to surface distance = 100). The curves (a), (b), and (c) are corresponding to 5 × 5 cm^{2}, 10 × 10 cm^{2}, and 15 × 15 cm^{2} field sizes, respectively. For more clarification, the data for 5 × 5 cm^{2} and 10 × 10 cm^{2} field sizes are scaled 0.8 and 0.9, respectively 
