Fig. 6
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Evolution of the semi-major axis over time for a sample of BBH progenitors in models with (right-hand panel) and without (left-hand panel) CHE. The evolution traces from the birth of the binary to the formation of the BBH (grey lines) or a BBH merger (red and blue lines). The two panels depict models at Z = 0.004, with similar results found at Z = 0.001.
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