Position-velocity diagram along the projected major axis of the satellite system. Red dots with 1σ error bars show satellites of Cen A with measured line-of-sight velocities. The contours represent the best-fit rotating disk model with v_rot = 90 km s⁻¹ and σ_int = 124 km s⁻¹. The inner and outer contours correspond to 1σ and 2σ probabilities of finding a galaxy at that location of the position-velocity diagram.