Table 1.

Parameters of the fitted function (Eq. (1)) and correlation coefficients for the studied fields and two megavoltage beams.

Field (cm × cm)	Accelerating voltage	Parameters of fitted function			R2
		y0	A	t
5 × 5	6 MV	14.19	−15.65	3.07	0.94
	15 MV	28.16	−25.26	4.78	0.94
10 × 10	6 MV	15.02	−16.99	8.22	0.93
	15 MV	26.97	−27.59	9.38	0.98
15 × 15	6 MV	17.47	−19.24	17.46	0.94
	15 MV	28.04	−29.11	17.19	0.97
20 × 20	6 MV	112.02	−112.97	206.96	0.98
	15 MV	29.59	−30.95	24.8	0.97