Distribution of the normalised ${\lambda }_{\mathit{Re}}/\sqrt{ϵ}$ spin parameter as a function of the K_s band absolute magnitude. The horizontal dashed line (at 0.31) separates slow rotators (below) from fast rotators (above). In the plot are galaxies from the M3G (large circles), MASSIVE (triangles), and ATLAS^3D (small green circles) samples. The M3G galaxies are split into BCGs (orange) and non-BCGs (blue), while other galaxies are from the same samples as on Fig. 6. The upper axis is in units of log solar masses, obtained with Eq. (2) from Cappellari (2013).