Fig. 4
Three projections of the continuum-subtracted HI data cube (RA, Dec, velocity) showing the arc-like connection between NGC 4418 and VV 655 in HI emission. For reference, the systemic HI velocities for VV 655 and NGC 4418 are 2202 ± 20 km s-1 and 2105.5 ± 10 km s-1, respectively (see Sect. 3.3.1). Note that this figure only shows the emission, not the absorption towards NGC 4418.
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