Observed and modelled orbits of Ba giants after the binary interaction along the RGB phase. The triangles indicate the initial period an eccentricity of each BINSTAR model and the blue dots indicate the final orbital parameters at the time of core-He burning onset. The evolution of the models that reached the core-He burning phase is represented by a dashed grey line. Orange crosses are observed orbits of low-mass (≲1.5 M_⊙) Ba and CH giants from Jorissen et al. (2019).