Top: radio continuum versus circular velocity (from HyperLeda). Bottom: radio continuum versus central stellar velocity dispersion. “Central” refers to standardized aperture r_norm of 0.595 h^-1 kpc, which is equivalent to an angular diameter of 3.4 arcsec at the distance of the Coma cluster. The lines show linear fits to the data points accounting for errors along both axes. The slope and intercept of the fit, the correlation coefficient, and the P-value of the Spearman test (see also Fig. 5) are shown in a corner of each plot.