Schematic representation of the X-ray lightcone LC30, where we show the distribution of galaxy groups and clusters with M₂₀₀ > 10^12.5 M_⊙ and colour-coded for their intrinsic X-ray luminosity in 0.5 − 2.0 keV within R₅₀₀. The X-ray emission is based on PHOX’s photon list. Each smaller panel represents the projected X-ray emission corresponding to the shells at different snapshots forming LC30 and has an angular scale of 30 × 30 square degrees.