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6. THE TIDY COMA: A PLACE FOR EACH GALAXY

When we say that Coma is a cluster of galaxies, we better specify the kind of galaxies we are speaking of. In fact, galaxies of different type and luminosity have different distributions in the Coma cluster, and the cluster looks different when only, say, the ellipticals, or the spirals are selected. Here I review the history of the discovery of galaxy segregation in the Coma cluster.