Middle panel: likelihood value using x^abd5 on the Ω_m-Σ₈ plane. The green star represents the input cosmology πⁱⁿ. Since log σ₈ and log Ω_m form an approximately linear degenerency, the quantity Σ₈ ≡ σ₈(Ω_m/ 0.27)^α allows us to characterize the banana-shape contour thickness. Right panel: the marginalized PDF of Σ₈. The dashed lines give the 1σ interval (68.3%), while the borders of the shaded areas represent 2σ limits (95.4%). Left panel: log-value of the marginalized likelihood ratio. Dashed lines in the left panel give the corresponding value for 1 and 2σ significance levels, respectively.