Table 1.

Voxel dimensions used in the study for low and high proton energies

Voxel dimensions [cm3]	Proton energy/Ionization potential energy
	E = 68 MeV I = 86 eV	E = 235.81 MeV I = 77 eV
0.05 × 1 × 1	v
0.1 × 1 × 1	v
0.1 × 2 × 2	v
0.1 × 3.4 × 3.4		v
0.2 × 3.4 × 3.4		v
0.2 × 7.4 × 7.4		v