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Fig. 4

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Channel maps (derived using robust weighting) centered on the velocity peaks as seen in Fig. 3 and averaged over a velocity range equal to the FWHM of the corresponding Gaussian fit. Contours correspond to 3σ, 5σ, 10σ and 20σ (3σ, 5σ, 6σ, 7σ in the rightmost panel). The small crosses show the positions of the AGN. The large cross indicate the phase tracking center.

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