LSDBinary algorithm flow chart. Bottom left panels show output of the LSDinit programme in terms of the LSD profiles computed from synthetic spectra (left) and the continuum flux ratio of the two binary components as a function of the wavelength (right). The output of the LSDBinary programme is illustrated in the two bottom right panels, showing LSD profiles of the individual binary components (left) and a comparison between the composite observed (black) and LSD-based model (red) spectra of the binary. See Sect. 3 for details.