Stellar mass as a function of the local over-density of galaxies in Hyperion. The blue-contours represent the distribution of the photo-z galaxies from their 1000 realisations. The purple stars are the spec-z Hyperion members, the pink diamonds represent the spec-z galaxies from HST-Hyperion sample. The best fit relation and the 1-σ error are shown as the black-solid line and the grey shaded regions respectively. The best-fit slopes and intercepts are written in the inset-yellow panel. The errors on the slopes and intercepts are the standard deviation of the slopes and intercepts of the 1000 relations.