Masses and orbital periods of LMC WN binaries with an O or early-B star companion (Shenar et al. 2019). The orbital periods of the two LMC WC binaries Brey 22 (right) and Brey 32 (left; Boisvert et al. 2008) and of SS 433 (Hillwig & Gies 2008) are indicated by arrows. We also plot the masses and orbital periods of the well-characterised BHs with an O or early-B companion, which are in order of increasing orbital period M 33 X-7 (Orosz et al. 2007), LMC X-1 (Orosz et al. 2011), Cyg X-1 (Orosz et al. 2011), and MCW 656 (Casares et al. 2014). Above ∼24 M_⊙ (or a corresponding luminosity of log L/L_⊙ = 5.8; Gräfener et al. 2011), no H-free Wolf-Rayet stars are known in the LMC, potentially because this corresponds to their Eddington limit (see text).