Energy dependence of scattering mean free path calculated with the diffusive transport model of Kontar et al. (2014), where A_LT = 26 Mm², d = 5.5 Mm, n = 9.5 × 10¹⁰ cm^-3. The uncertainties on the values of the mean free path derived from the fit (see Appendix C) and on the energy of the radio-emitting electrons are taken into account. The two most extreme slopes for the power-law dependence of the mean free path are plotted.