Distribution of the ratio β/K for ATLAS^3D ETGs with Σ ≥ 2500M_⊙ pc² (magenta histogram) and for those with Σ < 2500 M_⊙ pc² (blue histogram). Coloured solid lines are the median values of the two relative distributions, while black one refers to the total sample. We have included in the plot only local ETGs with stellar masses in the same range of dense high-z ETGs in our sample (10.7 ≲ LogM_vir/M_⊙ ≲ 11.5). The β parameter was derived through Eq. (3), while the K coefficient through Eq. (4).