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Fig. 2.


High-contrast B image of Arp 240 showing the extension of the tidal features of each galaxy, taken from the “Catalog of Peculiar Galaxies” (Arp 1966). The ellipses indicate the location of the bifurcation radius, Rbif, in the rotation curve of NGC 5257 and NGC 5258, respectively. These are discussed in Sect. 4.3.

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