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Fig. 2.
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Cumulative ejecta kinetic energy versus initial helium-star mass for the explosion models of Ertl et al. (2020). The integral is carried out from the center of the ejecta outward. Moderate ejecta kinetic energies of order a few 1050 erg are found in the lower mass helium-star models, which also have ejecta masses ≲1 M⊙.
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