AAOmega spectra of the ten early O-type stars in the sample (with each spectrum smoothed by a 5-pixel median filter for clarity and offset by 0.5 continuum units). Absorption lines identified in the spectrum of AAΩ 30 Dor 364 are: He II λλ4026, 4200, 4542, 4686; He I λ4471; N V λλ4604, 4620. The emission lines identified in the spectra are, in order of increasing wavelength: N IV λ4058; Si IV λλ4089, 4116; N III λλ4634-40-42; C IV λ4658. Broad absorption from the λ4430 diffuse interstellar band can be seen in some spectra (e.g. AAΩ 30 Dor 254).