Upper panel: all galaxies within a distance of one degree from NGC 3311 with a radial velocity limit of 20 000 km s−1. The Hydra I members stand out clearly. We select galaxies with a radial velocities less than 6000 km s−1. Lower panel: surface number densities in 8 bins. The parameters of two modified Hubble profiles are given, one of them fitted with the first bin skipped. The core radius is only badly defined and may be high.
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