Optical images of the selected systems overlaid with FUV emission from GALEX (pink) and H I emission from the VLA (blue). TDGs are indicated in yellow. North is up; east is left. The bar to the top-right corner corresponds to ~10 kpc for the assumed distances (as given in Table 1). NGC 5291 (left): composite ESO-NTT (BVR) and DSS image from B07. NGC 4694 (top-right): MegaCam/CFHT image obtained as part of NGVS (Ferrarese et al. 2012). NGC 7252 (bottom-right): composite ESO-MPG (BR) image from Baade et al. (1999).
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