Disentangling of the He I λ4388 line of VFTS 350. Shown are the normalised spectra of VFTS 350, vertically shifted by −1, at RV extremes (phases φ = 0.13 and 0.86, left and right panels, noisy blue line), compared to the disentangled spectrum of the primary (dotted red line), secondary (solid green line), nebula (solid purple line), and their sum (dashed black line). Dates in the legend are given as JD − 2 400 000. The disentangling is performed for the derived K₁ = 70 km s⁻¹ and K₂ = 91 km s⁻¹ (see text). The disentangled spectra are not scaled by the light ratio in this plot.