Panel a) evolution of the normalized number of binary systems with primary masses exceeding 2 M_⊙ (thin lines) and binaries with masses below 2 M_⊙ (thick lines) with time. Panel b) evolution of the normalized binary frequencies of binaries with high- (thin lines) and low-mass (thick lines) primaries with time. Panel c) evolution of the difference of the binary frequency of high- and low-mass stars with time. The difference at each time-step has been reduced by the initial difference of the binary frequencies to improve the readability. Crosses, stars, open, and filled squares denote simulations with initially 30%, 50%, 75%, and 100% binaries, respectively.