Fig. 1
Time evolution of Set 1 models with initial component masses of 0.8 and 0.75 M⊙ (broken lines, left axis) and initial periods of 1.5−3.0 d (solid lines, right axis). Only the six shortest-period binaries reach the RLOF phase within the age of the Universe, enabling the mass exchange between their components. All other binaries stay detached.
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