Fig. 1.
Histogram of the uncertainties on the intervelocities between members of galaxy pairs in the IGP Catalog (13 114 pairs). The bin width is 4 km s−1. The observed distribution shows two populations, one with accurate velocity errors < 20 km s−1 and a probability peak between 4 and 8 km s−1 (6026 pairs), and the other with less accurate values having errors peaked around 55 km s−1.
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