Absolute magnitude-anisotropy relations of CALIFA stellar disks at R = h∕2 (left) and R = h (right). Different colors and symbols represent different disk morphologies from Sa to Irr. The solid line is the most likely linear fit to β_ϕ (at R = h∕2 only). Crossed symbols and dotted lines represent the observed and best-fit relations predicted by the epicycle approximation for the same CALIFA disks, as deduced from circular velocity curves of Kalinova et al. (2017). Gray circles and dashed lines are the observed and best-fit relations predicted by the epicycle approximation for other galaxies, as deduced from Hα rotation curves of the GHASP sample of Epinat et al. (2008a,b).