Ratio of the contribution to the total cross section from the large-angle regime (dashed lines) and of the modified transfer cross section from the small-angle regime versus the critical angle θ_c used to separate small- and large-angle regions within the hSIDM scheme for the ‘Møller’ cross section Eq. (1) and r = 10², 10³, 10⁴, respectively. Solid lines characterise the expected physical relevance of small-angle scattering (in relative units). For moderate values of θ_c ≲ 0.5, dashed lines conservatively estimate the expected ratio of the numerical effort of hSIDM compared to a naive implementation of angle-dependent scattering.