Notes. Columns 1 and 2: J2000.0 coordinates of the object (in decimal degrees); Col. 3: redshift (the number of significant digits depends on the spectrum quality, galaxies marked with a * are potential group members); Col. 4: nature of the object (galaxy, active object, star); Col. 5: source (TNG, NED). The typical uncertainty on non-literature redshifts is 0.001. Given the low signal-to-noise ratio of the TNG spectra, we chose to use mainly literature redshifts when available. We note that the group velocity dispersion was computed without the z = 0.0565 galaxy.