Results of the fit to the spectroastrometric Brγ data. The left panel shows the rotation curve projected along the line of nodes, S_ch vs. V_ch. The right panel shows the r = |S_ch − S₀| vs. V = |V_ch − V_sys| rotation curve. The solid red lines represent the curves expected from the model. The dotted line in right panel represents the rotation curve due to the star component of the gravitational potential.