Description:et al. 2000). 2. The Data. We derive the group catalog from the official distributions of the UZC (http://cfa- . problem we introduce a half degree gap between the two surveys. In conclusion, the SSRS2 .. Padilla, N. D., Merchán, M. E., Valotto, C. A., Lambas, D. G., & Maia, M. A. G. 2001,. ApJ 55