﹩68.3 \% ﹩ and ﹩95.5 \% ﹩ credible regions in the w–﹩{\omega }_{g}﹩ plane (left panel) and in the w–H₀ plane (right panel). The blue (outer) contours are for the Λ-GDM run for the PPS+Lens data set combination, and the yellow (inner) contours are for the PPS+Lens+BAO data set combination. The left panel shows a strong negative correlation between these parameters due to their effects on the radiation–matter equality, whereas the right panel shows a strong positive correlation between these parameters due to their effect on the background expansion history.