Top: Observed spectra in different orbital phases around the Mg I 5167–5183 Å triplet and Fe II 5169 Å lines. The mean disentangled spectra for the primary and secondary components are shown in blue and red, respectively. Bottom: Trails of Na D, Si II, and Hα lines (from left to right) showing the variation of the position of the lines of both components during the orbital cycle. The relative intensity of the lines is also indicated.