Sky distribution (within the A2063 field of view) of the galaxies with a measured spectroscopic redshift (from NED) between 0.0285 and 0.03963 (black dots). The cluster bulk (as determined by the SG method) is shown as blue filled circles. The CGCG 077-102 pair is shown by the red filled circles. Other SG-detected pairs are shown with the other filled circles with different colors. Top: full field of view. Bottom: zoom onto the cluster center.