Ratios of number density profiles of faint galaxies in fossil and control groups at different evolutionary stages. The left plot shows the evolution of the ratio between the number density of faint galaxies in fossil F₁₂ and control C₁₂ groups as a function of the 3D normalised distance to the centre of the group. The right plot shows the same, but using fossils F₁₄ and control C₁₄.