X-shooter spectrum (ID 5 in Table 1) displayed in blue and one of the UVES spectra (ID 10 in Table 1) in red. The spectra are convolved with a Gaussian with an FWHM = 0.4 Å to reduce the noise and to make the RV shifts visible. The region containing Hγ, He I λ4387, and He I λ4471 lines is shown. In the spectrum shown by the red line, the primary’s spectrum is redshifted (see Hγ), while the secondary’s spectrum (broadened He I lines) is blueshifted. We note that the primary also partially contributes to the He I lines.