MCMC post burn-in distributions for the one-population models with M_• as free parameter (Sect. 4.1). The scatter plots show the projected two-dimensional distributions, the red lines the respective 50th percentile, and the dashed grey lines the 16th and 84th percentiles. Their values are also written on top of each column, displaying the projected one-dimensional distributions. From top to bottom and left to right, the panels show the inner anisotropy β₀, outer anisotropy β_∞, the anisotropy transition radius log(R_β), inner rotation parameter κ₀, outer rotation parameter κ_∞, the rotation transition radius log(R_κ), the mass-to-light ratio 𝚼, fraction of background stars ϵ in percent, and the black hole mass M_• in 10⁶ M_⊙.