Fig. 2.
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Time evolution of the ionization fraction of the ejecta. Different line styles represent cases of different ejecta mass, while different colors represent different composition. Recombination effect is important and generally the heavier the ejecta, the lower the ionization fraction. For pure helium ejecta, the ionization fractions are much lower than those of hydrogen ejecta, giving rise to smaller DM and RM contributions.
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