X-ray surface brightness profile, together with the best-fit double-β model of Eq. (2). The best-fit parameters are Σ₀₁ = 0.56 ± 0.05 cst s⁻¹ arcmin⁻², r_c1 = 189.62 ± 0.41 kpc, β₁ = 2.17 ± 0.91 and Σ₀₂ = 0.35 ± 0.04 cst s⁻¹ arcmin⁻², r_c2 = 257.04 ± 0.25 kpc, β₂ = 0.80 ± 0.04 with χ²/d.o.f. ≃ 1.64. The vertical line indicates R₅₀₀. The surface brightness values have errors on the order of 1−2%; thus, error bars on the y-axis are not visible in this plot.