Positions (b_c in pc) of the α Per (top row), the Pleiades (middle row), and Praesepe (bottom row) stellar and substellar member candidates in space. Overplotted in cyan are different annuli from the cluster to visualise the distribution and extension of cluster members. Black symbols represent member candidates inside the tidal radius, while grey symbols highlight all candidates in our search up to three times the tidal radius.