Fraction of ETGs as a function of galaxy density, in the highest-redshift bin, 0.75 < z < 1. The stellar mass range is shown in the top right corner. The ETG fractions from the entire cluster sample of P05 are plotted as black dots. The two samples are comparable, as they are selected at roughly the same depth; however, the morphological classifications were not done in the same way, which may possibly lead to differences in the ETG fractions. Despite these slight differences, the fractions are in good agreement except for the fact that we do not reach Σ₇ ≳ 1000 gal Mpc⁻².