Marginal posteriors for Ω_m (left panel) and the dark energy equation of state, w₀ (middle panel), for ∼3000 MCMC realisations, ignoring the burn-in phase of ∼250 Markov steps. The corresponding mean and standard deviation for each parameter are indicated in the top right corner of each plot. The joint posterior (right panel) for Ω_m and w₀, depicting the high level of correlation between these two parameters. The highly informative distortion due to the cosmic expansion, as a result of probing a deep redshift range, yields extremely tight constraints on the above cosmological parameters. As a consistency test, this validates our implementation of the AP test to correctly recover the input cosmology.