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Table 3

Fit parameter a of Eq. (2) for the different cases for the energy production from Table 2.

Case a

Stellar winds at low metallicity, [Fe/H] = −1.5 1.23
Stellar winds at solar metallicity 0.368
Normal supernovae, E0 = 1051 erg 0.337
Hypernovae, E0 = 1052 erg 0.0554
Hypernovae, E0 = 1053 erg 0.0110

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