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Fig. 2.


Image in the g band from the CFHT Megacam of NGC 474 and companion NGC 470, enhancing the low surface brightness features, such as the shells (Duc et al. 2015). The CO(1–0) 23″ beam is indicated at the center of NGC 474, and the maps of the CO(2–1) 11″ beams cover its companion (see the appendix).

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