δ Vel Aa-Ab visual orbit: AMBER positions (black dots with error bars, see Table 1); fitted orbit (gray line), Aa stellar disk (dark gray disk with blue surrounding), the position of Ab at periastron (red dot) and Ab stellar disks for the positions of the eclipses (gray disk with red surroundings). Residuals to the orbit (red lines, too small to see in most cases) and quality of the fit (in number of sigmas). The overall agreement corresponds to a reduced χ² of 1.05.