Fig. 2
Rectified blue-region spectra of VFTS 450 and 652, velocity shifted to the rest frame of the primary. The data are LR02 and LR03 spectra from MJD 54 748, 54 810 (VFTS 450; φ ≃ 0.12 from the circular-orbit ephemeris in Table 5) and 56 294, 54 808 (VFTS 652, φ ≃ 0.66), merged at ~4560 Å. Secondary spectra are offset by ca. +260, −150 kms-1 (VFTS 450, 652, respectively). Narrow Balmer emission is nebular.
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