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Fig. 1.


Top panel: high spatial resolution HST image of Arp 240 taken with the Advanced Camera for Surveys (ACS) in its Wide Field Channel (WFC) in the F435W filter (between U- and B-bands). Middle panel: HST-ACS WFC image in the F814W filter (close to the I-band). Bottom panel: monochromatic Hα (continuum subtracted) image of the pair obtained from the scanning Fabry–Perot interferometer PUMA data cubes. 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. HST images taken from the HST archive, proposal 10592 by Aaron Evans. NGC 5257 is the galaxy on the right of the image, and NGC 5258 is the galaxy on the left. North is to the top, east is to the left.

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