Normalised injection functions (left panel) with peak injection at 5.0 R_⊙ and differing decay rates versus the radial position of the shock, r_i. Only values of N(r_i) > 0.001 were plotted for clarity. The corresponding total precipitation fraction (, right panel) versus the value of the constant C. Each coloured point in the right panel represents for the same coloured curve in the left panel, calculated using r_ini = 1.20 and r_fin = 70.91 R_⊙, for λ = 0.1 AU.