Positions and velocities of PNs (red diamonds, labels indicate the PNs’ V_LOS in km   s^-1) associated with the red peak at 5000 km   s^-1 in the PN LOSVD of the Hydra I cluster, from Ventimiglia et al. (2011). The red peak PNs are superposed on the residual V-band image, which shows the substructures in the diffuse light in the Hydra I cluster core. The black crosses indicate the position of NGC 3311 (center) and NGC 3309 (upper right), respectively. The green crosses indicate HCC 026 and HCC 007. The FoV is .