Comparison between data and model of f_σ, λ(X_off) and f_σ, Xoff(λ). Top panels: the straight red lines indicate the integral on the best-fit model, while the shaded blue areas represent the integral on the 3d h(σ, X_off, λ) data with 1σ uncertainties. Each bottom panel shows the residual trend with σ error; the straight black line represents the perfect match between data and model with null residual. Top left panel: f(X_off) as a function of X_off. Bottom left panel: residual between f_σ, λ(X_off) data and model in logarithmic scale. Top right panel: f(λ) as a function of λ. Bottom right panel: residual between f_σ, Xoff(λ) data, and model in logarithmic scale.