Relationship of three energy components: electron thermal energy, proton thermal energy, and magnetic field energy. Left: T_e/T_p − β_p histogram for regions in the cocoon for model A (a), model B (b), and model (c) at t = 9.52 − 9.94 and 13.02 Myr, respectively. The dashed line depicts the electron to proton temperature ratio corresponding to the equilibrium state for plasma β_p, as implied by the turbulence heating in Eq. (24). Right: Same as left panel, but displaying U_e − U_mag histogram. Dashed line plots U_e = U_mag.