Examples of spectral disentangling for HDE 255 312 at orbital phases ϕ = 0.36 and 0.446. The observed spectrum (black) is shown together with the disentangled spectra of the primary (red) and secondary (blue) components. The synthetic composite spectrum (cyan), obtained by summing the disentangled components weighted by their flux contributions (fracl : 55%, frac2: 45%), is also displayed. The agreement between the observed and reconstructed spectra demonstrates the quality of the disentangling performed with the UNWIND program.