CO morphology and kinematics of the four cluster members at z = 2.51. From left to right: ALMA maps (1.4″ × 1.4″) of velocity-integrated CO(1−0) flux (Moment 0), velocity field (Moment 1), velocity dispersion (Moment 2), position-velocity (PV) diagrams along the major axis, the best-fit Moment 1 model with GalPAK^3D, and the residual between the data and the model. We note that these maps are without correction for beam-smearing. Gray-filled ellipses indicate the angular resolution of 0.31″ × 0.25″. The four member galaxies have regular rotating disks of molecular gas.