Evolution of the median lifetime of CRe and the evolution of their median Lorentz factor for the different families of tracers. Top panels: Evolution of the mean values of the loss or reacceleration timescales for different electron energies, for tracers ending in the classicalRH or megaRH regions (left). Lower panels: Evolution of the mean γ of electrons starting from γ_inj = 100 or 1000, and ending up either in the megaRH (left) or classicalRH (right) region.