Fig. 8.
Tree for the field sample. Only groups with more that 23 galaxies are identified. The tree on the left has been rooted with the group (at the top) that has low values of B − V, nV, and log(M*). Group F6 is a pre-cluster and occupies a single branch of the tree indicated by the tick mark. To the right we show the same tree but unrooted.
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