Relative excess of flux density in stacking measurements caused by clustered neighbors as a function of redshift. These values were derived for a stellar mass selection (3 × 10¹⁰ M_⊙). The black squares are the results from our simulation. The blue triangles were derived using a simulated map built from the real positions and the stellar masses of the galaxies in the COSMOS field (Béthermin et al. 2015a). The red diamonds were derived using a decomposition of the real stacked images into a point-like and an extended clustered component (Béthermin et al. 2015a).