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Fig. 4

image

In color: different absorption systems identified in the nuclei of Arp 220 as observed in HCO+3−2. Overlaid, the contours represent the continuum emission. Panels a) and b) show 25 km s-1 individual channels centered on 0 and −150 km s-1, respectively. Panel c) presents the integrated emission in the velocity range [−625, −525 ] km s-1.

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