Mirror point radius, r_mp, versus particle initial pitch angle, α_i for simulations with injections at 10 R_⊙ (green circles), 20 R_⊙ (orange squares) and 30 R_⊙ (purple triangles) with λ = 0.1 AU. The green, orange, and purple dashed lines show the analytical, scatter-free mirror point radius, given by Eq. (2). The horizontal blue dashed line denotes the required depth in the solar atmosphere the protons must reach to generate γ rays (1 R_⊙).