Left: different injected electron anisotropy at the loop apex using S(μ) (Eq. (11)). Small Δμ produces beamed distributions while large Δμ produces isotropic distributions. Right: turbulent scattering mean free path λ_s versus electron energy E using Eq. (7) and using λ_s, 0 = 2 × 10⁷,  2 × 10⁸ and 2 × 10⁹ cm. Turbulent scattering quickly isotropises higher energy electrons. The mean free path λ_s is also compared with the collisional mean free path (using λ = v⁴/Γ; grey dashed and dotted lines) for three different densities of n = 1 × 10¹⁰ cm⁻³, n = 1 × 10¹¹ cm⁻³ and n = 1 × 10¹² cm⁻³.