Model fits to the spectrum of VFTS 621, with the best fit from the HHe (T_eff = 36 kK, log g = 3.8) and HHeN (T_eff = 54 kK, log g = 4.2) analyses shown in red and blue, respectively. The log Q as well as the helium and nitrogen abundances are the same in both models. These single-star models both suffer deficiencies that are suggestive of a composite observed spectrum, as seen in HST images (Fig. 4).