Fig. 13.
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Moment-1 map from VLA-B configuration 21 cm data showing the intensity weighted line-of-sight velocity field of H I (top: untapered data; bottom: 7 kλ tapered data). The purple contours mark various Hα surface brightness levels as in Fig. 1. For the zero-point velocity the optical recession velocity from the eastern galaxy, v0 = c ⋅ z = 4053 km s−1 (Moiseev et al. 2010), was used.
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