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Fig. 4
Channel map of the HCN 3−2 emission towards Mrk 231, as obtained from the combination of the A and B configuration data. Contours are logarithmic: 3.6 × (1, 2, 4, 8, 16) mJy beam-1 where the first contour is at 4.5σ. The synthesized beam of 
is shown in the upper left panel.
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