From top to bottom and left to right: (1) Best-fit model of VFTS 527 primary (red line) compared with the disentangled spectrum (black line), (2) same as for (1) but for the secondary. (3) Spectral Energy Distribution of VFTS 527. (4) Comparison between the disentangled spectra (scaled by the brightness factor of each component and shifted by their radial velocities) and one observed spectrum (5) Individual HRD (Left) and (6) log g–T_eff diagram of the stars of VFTS 527.