Fig. 3.
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Resulting effective spin for orbit-aligned BBHs as a function of mass ratio and chirp mass, under the assumption that both BHs have the maximum spin allowed by the critical rotation limit of their progenitors. Results are shown for a metallicity of Z ≃ Z⊙/50, and the truncation of the q = 0.25 line is due to the limited range of masses modeled.
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