Final radial entropy profiles as a function of r/r₂₀₀ for the four relaxed test clusters. The gas entropy is plotted in units of S₂₀₀ Different line styles refer to different clusters, the numbers indicating the cluster membership in the cosmological ensemble from which they have been extracted. Thin (black) lines are for the profiles of runs performed using the standard SPH formulation, while thick (red) lines refer to the AC-SPH runs incorporating the AC term.