Major energy sources (dashed lines) and sinks (solid lines) during the CE simulation with q = 0.25, C_d = 0.23, and C_h = 4.0. Shown are the total injected energy, ΔE_heat, the change in internal energy, ΔE_int, the total released recombination energy, ΔE_rec (the recombination energy is part of the internal energy and is only shown separately to highlight the contribution from recombination), the change in orbital energy, ΔE_orb, according to Eq. (34), the extra term ΔE_m defined by Yarza et al. (2022), the change in the gravitational energy, ΔE_grav, and the energy that is carried away by radiation, ΔE_rad. The vertical dashed gray line indicates the end of the dynamical plunge-in phase as determined by Eq. (22). The energies are shown in units of the initial binding energy of the envelope with E_bind, ini = −4.03 × 10⁴⁵ erg, calculated via Eq. (32). The lines showing contributions from ΔE_orb and ΔE_m are dash-dotted as they show source terms for the heating ΔE_heat but are not direct energy sources in the MESA simulation.