Notes.z_cl is the estimate of the cluster redshift, determined as the mean of the Gaussian fit to the redshift distribution. In the third column, N_tot refers to the number of member galaxies within the scale radius, R (see Table 1). The fourth column shows the global velocity dispersion, estimated from the Gaussian fit to the redshift distribution. The fifth and sixth columns display, respectively, the rotation amplitude and the projected position angle of the axis determined in the manner described in Section 3. For the three clusters A16, A1186, and A2256, SDSS does not provide spectroscopic data; therefore, the sample for rotation detection is reduced to 17 clusters.