Simulated incomplete observations of RV and astrometric data of the secondary SMBH (red crosses) and the distribution of the modelled posteriors (black dots) for the evolving model given in Fig. 5 (f_orb ~ 5%), upper row) and Fig. 6 (f_orb ~ 10%), bottom row). Left column: RV data for the secondary SMBH and the posterior distribution of simulations over time. We note here the RV curve gradient differences: almost constant (upper row) and variable (bottom row). Right column: astrometric observations of the secondary SMBH and the posterior distribution of simulations over time.