Table 3.

Chamber measurement data for ‘Rails Out’: average magnitude (along with standard deviation and maximum deviation) of the percent difference between the TPS dose with couch model and the measured dose

	6 MV FFF			10 MV FFF
Rails Out	$2\times 2 {\mathit{\text{cm}}}^2$	$4\times 4 {\mathit{\text{cm}}}^2$	$10\times 10 {\mathit{\text{cm}}}^2$	$2\times 2 {\mathit{\text{cm}}}^2$	$4\times 4 {\mathit{\text{cm}}}^2$	$10\times 10 {\mathit{\text{cm}}}^2$
All Zones	0.88%	0.76%	1.05%	0.86%	0.58%	0.63%
(SD)	(0.80%)	(0.51%)	(0.85%)	(0.74%)	(0.38%)	(0.53%)
[max. dev.]	[2.53%]	[1.73%]	[3.24%]	[2.30%]	[1.41%]	[1.68%]
Zone 1	0.28%	0.37%	0.82%	0.25%	0.45%	0.43%
	(0.27%)	(0.32%)	(0.31%)	(0.13%)	(0.17%)	(0.21%)
	[0.65%]	[0.79%]	[1.39%]	[0.39%]	[0.66%]	[0.75%]
Zone 2	1.21%	0.98%	1.26%	1.20%	0.68%	0.75%
	(0.78%)	(0.43%)	(0.98%)	(0.71%)	(0.35%)	(0.59%)
	[2.53%]	[1.73%]	[3.24%]	[2.30%]	[1.41%]	[1.68%]
Zone 3	0.43%	0.43%	0.59%	0.38%	0.39%	0.45%
	(0.70%)	(0.52%)	(0.51%)	(0.54%)	(0.58%)	(0.52%)
	[1.86%]	[1.44%]	[1.43%]	[1.43%]	[1.37%]	[1.37%]