Illustration of the binary stellar evolution leading to a BH+BH binary according to the standard scenario. Acronyms used in the figure. ZAMS: zero-age main sequence; RLO: Roche-lobe overflow (mass transfer); WR-star: Wolf-Rayet star; SN: supernova; BH: black hole; HMXB: high-mass X-ray binary; CE: common envelope.
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