Completeness and efficiency as a function of the number of visits (N_visits) for different fiber-positioning systems (FLEX, tilting spines, dual rotator, pick-and-place, and starbugs). Each figure corresponds to 500 fibers, except for the FLEX. The left panel in each row shows completeness (%), while the right panel shows efficiency (%). The top panel corresponds to 500 targets and the bottom panel corresponds to 1000 targets, respectively, for different fiber densities.