Gravimetric Power Limits (Theoretical) was a 24th century technical manual written by Leah Brahms. This manual, written by a member of the Theoretical Propulsion Group, covered how gravity imposed power limitations on the subspace warp field propulsion system of a Galaxy-class starship. A copy of this manual was stored in the Subspace Warp Field Overview, a folder in the Engineering Systems Database, aboard the USS Enterprise-D in 2366. (TNG: "Booby Trap" , okudagram)