Relevant portions of example models (black lines) fitted to observations (color code of Fig. 3). The full plots are shown in Figs. A.1 and A.2. Unlike Fig. 3, radial velocities of observed spectra have been corrected with the values of Tables 3 and 5, and the higher resolution spectra have been degraded to the lower resolving power when two observations are simultaneously fitted. The observed spectra above the dotted line are well fitted to a single model. Below that line, the spectra show clear signs of binarity (see Sect. 3.5); in these cases, we fit each dominant source.