Illustration of the SFR computation method for a given SF halo in a kth simulation snapshot at a given redshift z_k. The total SFR of an object is computed by summing the SFR of the galaxies inside a cylinder of length D_L(δ_z) and diameter D_s(θ) centred on the halo. The contributions of N background and foreground boxes along the LOS are considered by adding the mean total SFR computed inside cylinders with the same parameters D_L(δ_z) and θ in the nearest snapshots at the lower and higher redshifts, z_k − 1 and z_k + 1.