Total voxel number (first column) and voxel energy distribution (second column) of primary beams in VCyl3 (a, b, c) and the core of voxel energy distribution for (1H, 3He, 12C) (d, e, f). The f(T.V.N.) is the distribution of total voxel numbers and the f(V.E.) is the voxel energy distribution of the core region defined as the inner 100 nm radial distance of (1H, 3He, 12C) at (32, 38, 59) MeV/n.