Fig. 3.

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Likelihood of original BH mass at formation being below the TOV limit of 2.2 M⊙ as a function of coupling constant k. The blue line is for Gaia BH1, red for Gaia BH2, and black for the combination of both. As the measurements of Gaia BH1 and BH2 are statistically independent, the combination is simply the product of the two individual likelihoods. Additionally, the gray-dashed line shows the combined results for a higher TOV limit of 2.6 M⊙ (Rocha et al. 2021) while the gray dotted line shows the combined results for a mass gap with a minimal BH mass of 5.4 M⊙ (Ye & Fishbach 2022).
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