X-shooter/Ca II 849.8 nm line at periastron in the last orbital cycle. The double-line feature in grey is fitted using three Gaussian profiles in black, magenta, and blue. The third component in blue is used to subtract the absorption features around each peak in emission. Shaded regions represent the integrated flux of each component. Bottom, X- shooter/Ca II 849.8 nm in the post-periastron phase of the middle orbital cycles. The double-line feature in grey is fitted using two Gaussian profiles in black and magenta. Shaded regions represent the integrated flux of each component.