Fraction of released recombination energy (f_rec) and contributions of hydrogen (H II), singly ionized helium (He II), and doubly ionized helium (He III) for the simulation with q = 0.25, C_d = 0.23, and C_h = 4.0. The total fraction of released recombination energy is shown in black. The horizontal dashed colored lines show the initially available recombination energy in each species. The vertical dashed gray line indicates the end of the dynamical plunge-in phase as determined by Eq. (22).