X-shooter/Ca II 849.8 nm continuum-subtracted line across the second to seventh orbits. The orbital phase of each line in indicated in the right upper part of each sub-figure. Dotted magenta and black lines indicate the RVs of primary and secondary, respectively. Epochs with one RV value correspond to epochs with single BF, where RV₁ = RV₂ are indicated with a dotted purple line. The lines were shifted to the rest-frame of the secondary.