Predicted entropy profiles for a halo mass of 10¹³ M_⊙ (blue), 10¹⁴ M_⊙ (red) and 10¹⁵ M_⊙ (black) respectively, compared with the observed mean entropy profile and intrinsic scatter (orange shaded region) from the REXCESS sample of galaxy clusters, (Pratt et al. 2010), which features a median mass of M₅₀₀ ∼ 2.5 × 10¹⁴ M_⊙. To ease comparison with observational data, the predicted entropy has been rescaled by K₅₀₀ and radius by R₅₀₀.