Simultaneous fit to the FEROS RVs of the stripped B star (upper panel) and the GRAVITY relative astrometry (lower panel) obtained using an adopted distance of 340 pc (Table C.1). The corresponding MCMC grid is displayed in Fig. C.1. The dashed blue and red lines in the top panel show the best-fit RV of the stripped star and the predicted secondary RV-curve for the adopted solution respectively (see other solutions discussed in the text). The horizontal dotted line shows the systemic velocity of the system. Bottom panel: we followed the definition of Bodensteiner et al. (2020b) for the identification of the primary and secondary components in the system and placed the suspected stripped B star at coordinate (0,0).