Joint posterior constraints in m_c–a_c space. The dark and light regions indicate, respectively, the 1σ and 2σ confidence intervals for RV constraints (green), astrometric constraints (blue), and our final combined fit (red). The hashed region is observationally forbidden by our work. The parameter space above the black dashed lines is observationally forbidden by A25, see Section 5 for further discussion about this. For a more detailed comparison between this work and A25, see Section 5.