In less than ideal sensor conditions, a ship could be identified by the pattern of its shield harmonics. (VOY: "Innocence") In 2366, when the non-corporeal Koinonians drained antimatter from the antimatter pods to use it as energy to create their replica of Marla Aster, it was stopped by increasing the shield harmonics to match the antimatter containment, effectively severing the Koinonian beam. (TNG: "The Bonding" ) In 2375, One, an advanced Borg drone with 29th century technology, remodulated Voyager's shields to break the ship free of a Borg sphere's tractor beam. (VOY: "Drone")