Confidence regions in the (w₀−w₁) plane, as provided by Cosmography II, for the CPL parametrization of the dark energy. The inner brown region defines the 2σ confidence level. These parameters are well constrained, and the values w₀ = −1, and w₁ = −1 (which characterize the standard ΛCDM model) are statistically not favorable. The bottom and top of the diagrams plotted on the axes correspond to the 25th and 75th percentile, and the band near the middle of the box is the median.