KDE showing f_esc, HII as a function of IR ratios. The KDE represent the distribution of all the MCMC draws for galaxies with N ≥ 2 only and ρ the associated Spearman correlation coefficient. For this, we group the MCMC draws for our selected sample by bins of f_esc, HII and fit each bin with a gaussian 𝒩(x₀, σ²). The blue dots and dashed lines respectively represent the gaussian mean x₀ and the gaussian width σ. The plain blue line shows a weighted linear regression applied to the gaussian centers, accounting for the widths of each bin. The corresponding fit values are provided in Table A.2.