Profiles of mean LoS velocities over dispersions of the halo systems along the disk planes. The LoS dispersion is computed in each bin, not in the central region. The red solid line indicates the results of Sect. 3.1; the green long-dashed and the blue short-dashed lines indicate the cases of 5 clumps with separations of 2 kpc and 1 kpc, respectively, in Sect. 3.2; the pink dotted line indicates the result of Sect. 3.3; the light blue dot-dashed lines indicates the results of Sect. 3.4.
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