Residual UVES He Iλ5876 Å profiles (black dots). In each panel, the two-Gaussian fit to the emission peaks (green full line) and the individual Gaussians corresponding to the primary (blue dashed line) and secondary (red dashed line) component are overlaid. The blue and red vertical ticks mark the expected position of the lines of primary and secondary component, respectively, according to the photospheric RV. The dashed brown line in the upper panel represents the Gaussian fitted to the excess blueshifted emission observed only in this spectrum. The reduced Julian day and the orbital phase (ϕ) are marked in the upper right corner of each box.