Bivariate distribution of the rotational characteristics of vortices in the middle photosphere during the saturated phase of the SSD for the four stellar models. Every identified vortex is represented by a scatter point according to the Rortex criterion R_z and the magnetic Rortex criterion $R_z^{\mathrm{B}}$ averaged over its area. The vertical magnetic field B_z averaged over the swirl area is color-coded.