X-shooter/Ca II 849.8 nm continuum-subtracted line across the first orbital cycle. The orbital phase of each line is indicated in the upper right of each sub-figure. Dotted magenta and black lines show the RVs of the primary and secondary, respectively. Epochs with a single RV value (where RV₁ = RV₂) are shown with dotted purple line. Lines are shifted to the rest-frame of the secondary.