HST F814W images (Koekemoer et al. 2011) of three galaxies with reliable systemic redshift and ISM-shift estimations. Upper row: these galaxies are visually identified as merging or interacting systems, as showing, from left to right, bridges connecting the interacting components, a very disturbed and asymmetric morphology, and a double nucleus. Bottom row: three examples of isolated or non-interacting galaxies with a discy shape (first case) and a more spheroidal structure (second and third image).