Histogram of the distribution of parameter ϑ = (R_L − R₁)/R₁, resulting from the simulations described in Sect. 4.4. The vertical dashed black line indicates ϑ = 0, when the system becomes semi-detached. The vertical blue lines indicate quantiles at levels of 0.16, 0.5, and 0.84. Only about 3% of samples correspond to an RLOF at periastron, while their majority (∼97%) points toward the detached geometry at periastron.