Calculated differential equilibrium electron numbers (N_e; solid lines) for two differential injection rates of primary electrons (dQ_e,p / dt; dotted lines): a) s = 3, E_min = 10 keV; b) s = 2, E_min = 1 MeV. Also shown are the differential production rates of secondary, knock-on electrons (dQ_e,s / dt; dashed lines). The H density in the nonthermal X-ray production region, which intervenes in the calculation of N_e,p and N_e,s, is n_H = 10⁴ cm^-3 and the path length of the primary electrons in this region is Λ = 10²⁴ cm^-2. The calculations are normalized to a total power of 1 erg s^-1 injected by the primary LECR electrons in the X-ray production region.