Table 2.

Small field output factors measured by DLOS∕PRESAGE with comparison to the data acquired on the same treatment machine as reported in Clift et al. Following each datum is the uncertainty of each measurement. The final column is a list of the percent difference of the DLOS∕PRESAGE with respect to the mean of commissioning, EBT, and OCTOPUS∕PRESAGE data.

Field size (mm)	Commissioning data	EBT (Ref. 30)	OCTOPUS∕PRESAGE (Ref. 30)	DLOS∕PRESAGE (this work)	Percent difference
30 × 30	–	0.892 ± 0.076	0.901 ± 0.027	0.898 ± 0.027	0.7%
20 × 20	0.858	0.886 ± 0.075	0.856 ± 0.026	0.890 ± 0.027	2.7%
10 × 10	0.767	0.795 ± 0.066	0.789 ± 0.024	0.802 ± 0.024	2.3%
5 × 5	0.626	0.636 ± 0.054	0.649 ± 0.019	0.611 ± 0.018	4.0%