Posterior distributions on the IMBH mass and region of influence in 47 Tucanae. Left: posterior distribution on the BH mass (blue histogram). The vertical line indicates the upper limit on the BH mass (578 M_⊙) containing 99.7% (3σ) of the posterior distribution. Right: spatial distribution of the kinematic sample of individual stars inside a circumference of radius of 12″ (black curve). Each star is color-coded according to the available kinematic information: LOS velocity (i.e., 1D velocity) in dark blue, proper motion (2D) in brown, and full kinematic information (proper motion and LOS velocity, i.e., 3D) in magenta. The blue shaded area indicates the region that would be influenced by a central BH with mass 578 M_⊙ (our 3σ upper limit), which has a radius of influence R_infl = 0.02 pc (red curve).