Function , the difference between (Eq. E.1) and its minimum value, for the CRG+ (left panel) and the CRG– (right panel) solutions. Under the assumption of Gaussian random errors, the 68%, 90%, 95%, and 99% confidence regions of the two parameters are the area where Δ(Ω₀, Ω_Ξ0) < 2.3, 4.6, 6.2, and 9.2, respectively. The 90% confidence regions are thus 0.43 + 0.44Ω₀ ≲ Ω_Ξ0 ≤ 0.5(1 + Ω₀) for the CRG+ solution and max{0, ( − 0.26 + 0.63Ω₀)} ≲ Ω_Ξ0 ≤ 0.5(1 + Ω₀) for the CRG– solution. In the two panels, there are no solutions in the white top left area. For the CRG+ solution shown in the left panel, for an easier comparison with the CRG– solution shown in the right panel, Δ(Ω₀, Ω_Ξ0) is not reported in the white bottom right area where Δ > 7.