Overluminosity of the SB 2 binaries from M. Kounkel et al. (2021) shown against the amplitude fraction of the cross-correlation peaks. Our overluminosity cut is shown as a dashed line, and the equal-mass magnitude offset is a solid line. The fraction will be close to 1.0 when the best-fit template matches both stars in the measured spectrum, making it a likely equal-mass system. It can be seen that our overluminosity method performs well across the range of amplitude fractions.