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Figure 2: An example of a linear fitting for the output factors of a 13.9 cm ×16.1 cm cutout in the A20 applicator with 18 MeV. The linear fitting equation and the R2 value are displayed in the graph

Figure 2: An example of a linear fitting for the output factors of a 13.9 cm ×16.1 cm cutout in the A20 applicator with 18 MeV. The linear fitting equation and the R<sup>2</sup> value are displayed in the graph