title: Unification and large-scale structure.
abstract: The hypothesis of relativistic flow on parsec scales, coupled with the symmetrical (and therefore subrelativistic) outer structure of extended radio sources, requires that jets decelerate on scales observable with the Very Large Array. The consequences of this idea for the appearances of FRI and FRII radio sources are explored.
authors.affiliation: Royal Greenwich Observatory, Cambridge, United Kingdom.
authors.forename: R A
authors.initials: RA
authors.lastname: Laing