Top: variation with phase of the RVs (solid line = primary, dashed line = secondary), separation, and position angle (defined to be zero when the primary is in front and along the line-of-sight). Bottom: the orbit of the primary star around the center of mass (see Table 3 for physical parameters). The position of periastron is shown with a big dot, of phases 0.1 to 0.9 with open squares, of phases 0.05 and 0.95 with crosses, and of phase 0.99 with a star. The line of nodes corresponds to the x-axis and the line-of-sight to the y-axis, with an Earthly observer towards the bottom. At periastron, a (arbitrary) sketch of the collision zone is shown as a pink dashed line, with the position of the secondary star shown as an open blue circle.