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It turns out that there are very few groups that are classified as
interacting quartets. Most of the ones that are outstanding are shown
on pages 4.1 and 4.2. It is surprising that a high percentage of them
have a linear arrangement. As in Category 3,
the phenomenon is probably related to the chaining in
Category 17 and diametric
companions in Category 8. In AM 0218-321 one
faint arm of the spiral
encircles the companion immediately to the north. This object is also
illustrated under Category 17.
CATEGORY 4:
INTERACTING QUARTETS
AM 0018-485 picture
AM 1957-471 picture
AM 1322-300 picture
AM 0556-425 picture
AM 0218-321 picture
AM 2147-490 picture
AM 2115-574 picture