Confidence ellipses on top of density levels for the last generations of a test dataset. Each subplot below the diagonal contains confidence ellipses corresponding to 1σ, 2σ, and 3σ confidence levels (red, orange, and yellow, respectively), derived from the covariance matrix of the parameters. Annotations in each subplot indicate the standard deviations along the axes (σx and σ_y) and the Pearson correlation coefficient (ρ).