Four different projections of the FP. The yellow dots mark the data of the Illustris simulation. The red dots are the sample with available stellar masses and velocity dispersion. The black dots are the BCG and second brightest ETGs of the clusters. The gray small dots are the optical and spectroscopic data for the objects that do not have a measured stellar mass. The dashed lines mark the region of the ZoE. The green and blue arrows mark the direction of a future evolution expected on the basis of the values of β. The green (blue) color indicates a positive (negative) value of β.