A life form indicator (LFI), though typically grouped with sensors, was technically a sophisticated computer program designed to be used in conjunction with other sensor types. They analyzed the data provided by other sensors to determine if a life form was present, and if so, what kind. For example, a full-spectrum transceiver might detect a 37.0 Celsius mobile heat source, massing at eighty kilograms, and that the ship's life support systems were providing a standard terrestrial atmosphere and gravity; an LFI would conclude that this being was probably a Human.