Estimated three-dimensional galaxy velocities (including a statistical correction factor of assuming dynamical symmetry) as a function of the projected separation with respect to the estimated halo center (also shown in Fig. 2). The CO(4–3)-line emitting galaxies and those with high-fidelity spectroscopic redshift from MUSE within |Δv_QSO|< 4000 km s⁻¹ are indicated by orange circles and violet crosses, respectively. The arrows indicate sources that lie outside the reported velocity range. The vertical dashed black and green lines mark the estimated virial (R_vir) and “turnaround” radius (R_ta). The blue and red curves are the predicted escape velocity corresponding to a central point-like object and a truncated NFW mass profile, respectively with a total mass equal to the estimated M₂₀₀. The shaded areas report the 1σ uncertainties. Galaxies that fall within the virial radius and the envelope are expected to be gravitationally bound.