I'm having trouble interpreting this picture. The article says 5 galaxies are to be seen. On the right hand side of the green arc I see what look likes two nuclei in one galaxy(I would assume these are the two that are "so beaten up"). On the left hand side I see two large galaxies, one at the top and one at the bottem. Is it the one at the top that is involved in the collision?

Obviously I've got this picture all wrong. Any help?