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Click here for Wookieepedia's article on the Canon version of this subject.  This article covers the Legends version of this subject. 

A vectral was an engine component designed to scatter and dampen exhaust emissions, thereby reducing a starship's sensor profile. The vectrals also served as a steering mechanism by redirecting the exhaust in flight to alter the ship's heading. Koensayr Manufacturing's BTL Y-wing starfighters employed disk-shaped vectrals at the end of their Ion Jet engines.

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