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Published online by Cambridge University Press: 25 May 2016
The structure of the quasar 3C 345 is studied at λ = 49cm. The core has a low-frequency cut off spectrum and α ≃ 3. The brightest knot is in the nearest part of the jet. The cocoon wall absorbs low-frequency emission and changes the polarization orientation, RM = 3500 rad m –2, B|| ≃ 100 μG at the core region.