Radial-velocity curve corresponding to the orbital solution, based on RVs measured on the steep wings of the Hα emission, plotted for phases from ephemeris (top; eq. (1)). Orbital curve based on RV of the He I 6678 Å shell line prewhitened for the long-term changes, plotted for the same ephemeris (bottom). Data from individual instruments are shown by different symbols. The circles are the same as in Fig. 2, and black triangle shows CTIO.