Table 1

Evolution of the mean relative statistical uncertainty () as a function of the three studied dosel resolutions and the Volume-Weighting (V-W) and Mass-Weighting (M-W) algorithms. The time gain factor (f_t) is calculated using the proportionality between the statistical uncertainty (σ) and the inverse square root of the number of primary particles in the Monte Carlo simulation. Knowing that the computation time (t) is proportional to the number of primary particles: .

Dosel resolution		Ratio
299 × 137 × 10	0.968	1	1
150 × 68 × 5 (V-W)	0.552	1.75	3.08
150 × 68 × 5 (M-W)	0.357	2.71	7.35
75 × 34 × 3 (V-W)	0.332	2.92	8.50
75 × 34 × 3 (M-W)	0.168	5.76	33.2