The plasma injection throttle subsystem was a component of the engineering systems on a Federation starship. This subsystem was concerned with the operation of the throttles, which were valves that regulated the flow of warp plasma into the plasma injectors. This subsystem could be modulated by an engineer. Aboard the Galaxy-class USS Enterprise-D, in the Engineering Systems Database, there was a folder titled Modulated Plasma Injection Throttle Subsys. This folder contained technical manuals relevant to the topic. (TNG: "Booby Trap", okudagram)

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