Fraction of ejected mass, M_ej, over time for the O.50 (dark blue and red) and the I.50 (yellow and green line) models. It is plotted with kinetic energy only (dark blue and yellow line) and including internal energy (red and green line), respectively, for I.50 (where internal means thermal energy) and O.50 (where internal means thermal plus recombination energy), respectively. The released recombination energy is shown in light blue on the right-hand axis.