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Fig. 1.
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Relative motion of two galaxies, labeled galaxy 1 and galaxy 2. The vector v1 (v2) represents the velocity of galaxy 1 (galaxy 2). The angle θ is measured between r1 and the line connecting the two galaxies. vc is the LoS velocity of the CoM of the pair. The assumptions for different infall models are shown in the top left.
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