2 The sample

Galaxies in the present study are selected from the CGCG Catalogue (Zwicky et al. 1961-68) in the region $11^{\rm h}30^{\rm m}<\alpha<13^{\rm h}30^{\rm m}; 18^{\circ}<\delta<32^{\circ}$ containing the Coma-A 1367 supercluster. There are 1130 galaxies listed in this region. Of these 1085 have $m_{\rm p}\le 15.7$. Another 45 belong to multiple systems which were split in their individual components, each of them fainter than the catalogue limiting magnitude 15.7. Out of the 1130 we observed 102 galaxies with no z values available in the literature. Only 17/1085 galaxies with $m_{\rm p}\le 15.7$ in the Coma region and 45/1130 fainter than this limit remain with unknown redshift, thus the sample is 98% complete at 15.7. Spectra of 3 galaxies belonging to the cluster A 262 and 12 to the Hercules supercluster were also taken as fillers.