KDR extents versus NLR extents on a logarithmic scale. There is a correlation between these extents, with a Spearman correlation coefficient of CC ∼ 0.53 and a p-value of 10⁻⁴. The best-fit linear regression (blue line) results in an intercept of ∼1.07 ± 0.22 and a slope of ∼0.53 ± 0.12. The uncertainties are represented by grey bars corresponding to differences in the value of the properties of 1σ.