Relativistic electron energy distribution for different times in the LF during the JCI. The distribution is roughly , as expected when IC-Thomson or synchrotron losses are dominant. At t_LF ∼ 10⁶ s, the IC cooling for electrons with E′∼10⁹ − 10¹⁰ eV occurs in the K-N regime, which leads to a hardening in the electron distribution up to energies at which synchrotron cooling takes over and softens the particle distribution.