DE component with decreasing w: a CPL model with w₀ = −0.9 and w_a = +0.1 (magenta) compared to ΛCDM (blue), both computed with our scheme. Panels on the left-hand column were computed using the early parametrization of H₀ = 67.56 km s⁻¹ Mpc⁻¹ from Planck Collaboration VI (2020), while panels on the right-hand column employ the local parametrization of H₀ = 73.04 km s⁻¹ Mpc⁻¹ from Riess et al. (2022). Top row: expansion histories; for the vertical lines in red see Fig. 7. Middle panels: CMB temperature spectra. Bottom panels: matter power spectra. In both columns, we see good overall agreement with ΛCDM, except for the fact that the chosen CPL model may provide a resolution to the Hubble tension problem. A difference remains in the present-day Hubble constant between left-hand and right-hand columns, see main text.