Impact of including different observations in a mock eccentric binary. Posteriors on the natal kick (v_k) and mass loss (Δm₂), when the various observational categories are included. Observational categories include spectroscopy (S), resolved astrometric orbit (O), and constraints on any of radial velocity (V_R), transverse velocities (V_T), or all three velocity components (V₃). All categories include spectroscopy (see Sec. 3.1 for justification). Categories without (with) the astrometric orbit are shown on the left (right). Colors correspond to differences in the available velocity constraints: when there are no velocity constraints (e.g., due to no host association; S, SO: dark green), when there are measured RVs for the source and host (SV_R, SOV_R: blue), when there are measured transverse velocities for the source and host (SV_T, SOV_T: yellow), and when there are measured velocities in all three directions for the source and host (SV₃, SOV₃: red). All results here apply for the eccentric mock system; the results for the circular mock system are shown in Fig. 3. Black dashed lines show the true values. Contours capture the 90% confidence interval of the 2D distributions.