Cumulative distribution functions of the RV separation (ΔVr) between the two stars in a binary system, ratio of temperatures (T1∕T2), ratio of radii (R1∕R2), and the relation between T1∕T2 and R1 ∕R2 in the fourth panel. The distribution of ΔVr is cut at the lower level of 15 km s−1 as explained in Sect. 6, while R1∕R2 starts at unity by construction because we define the primary as the star with a larger radius.
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