Fig. E.1.
Median relative error as a function of metallicity of the log-transformed and re-scaled six quantities Bi: the He-star mass (blue) and its carbon-oxygen core mass (orange) before the supernova, the orbital period before the supernova (red), the second-born BH mass (violet), the spin of the second-born black hole (brown), and the lifetime of the BH–He-star binary (green).
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