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Modeling the multiwavelength emission of successive regions in the jet of the quasar PKS 1136-135 we find indication that the jet suffers deceleration near its end on a (deprojected) scale of ~400 kpc. Adopting a continuous flow approximation we discuss the possibility that the inferred deceleration from a Lorentz factor Gamma=6.5 to Gamma=2.5 is induced by entrainment of external gas. Some consequences of this scenario are discussed.doi:10.1086/500536 fatcat:ct4mo4rphbaulguhs5kvbwgwqu