X-shooter and UVES/HeI 587.56 nm line across the last two orbits covered by this dataset. The orbital phase of each line is indicated in the right upper part of each sub-figure. The magenta and black dotted lines indicate the RVs of the primary and secondary, respectively. Epochs with single RV value correspond to those with a single narrow-peaked BF (RV₁ = RV₂) are indicated with purple dotted line. Lines are shifted to the rest-frame of the secondary.