Fitting results of H₀(z) in the Pantheon+ sample case for six redshift bins. The left panel shows the value of H₀(z) as a function of redshift. There is a clear decreasing trend. The green line gives H₀ = 73.04  ±  1.04 km s⁻¹ Mpc⁻¹ from local distance ladder and its 1σ uncertainty (Riess et al. 2022). The yellow line is the value of H₀ = 67.4 ± 0.5 km s⁻¹ Mpc⁻¹ from CMB measurements and its 1σ uncertainty (Planck Collaboration VI 2020). The right panel shows the normalized probability distributions of H_0, z in six redshift bins. These distributions are almost Gaussian.