Part of the observed FUSE spectrum (ID 1 in Table 1) covering the wavelength range of the LiF2 channel – the same as used by Penny & Gies (2009) to determine the projected rotational velocity. The observed spectrum, corrected for the velocity of the SMC, is shown as a solid blue line. The red dotted line is our best-fitting model with the primary’s projected rotational velocity v₁ sin i = 140 km s⁻¹. The gray solid line is another model where the primary’s projected rotational velocity is reduced to v₁ sin i = 140 km s⁻¹. The line identification marks correspond to the wavelengths in the rest frame.