Correlation function . Top panel shows the measurement (points with error bars), the best-fit GR model for a non-tomographic analysis (Ω_m = 0.27, σ₈ = 0.76) (solid), modified gravity models with the same standard parameters but (Σ = 1.6, γ = 0.55) (dashed), or (Σ = 1, γ = 0.65) (dotted). Bottom panel shows the deviation between the same dashed and dotted models with respect to the GR model.