Mono-energetic Green’s functions from 0.25 MeV to 3.5 MeV (coloured curves) assuming an instantaneous release at the Sun at t = 0 and assuming a spectral index of γ = 3.5, a radial mean free path of λ_r = 0.14 AU and taking into account the energy response of E03. The black curve shows the Green’s function of the channel (in units of counts s⁻¹) assuming the energy response computed by Bialk et al. (1991). The dotted curve shows the Green’s function of the nominal energy channel assuming a geometric factor of 0.48 cm² sr.