Summary of best-fit model parameters for the DIG leakage model applied to our entire sample. a) Variation in for the DIG spatial models described in the text as a function of the absorption coefficient, k₀, for all the galaxies in our sample. Low values of k₀ correspond to the case of spherical dilution, while high values correspond to exponential attenuation with scale length 1/k₀. For each galaxy, a coloured star denotes the model with minimum . b) Value of the additive offset, a₀, defined in Eq. (2), as a function of k₀. According to the simple model described in the text, a₀ ∼ 0. Star symbols correspond to the k₀ values with the lowest , which are clustered around a₀ ∼ 0. c) f_esc, the escape fraction of ionising radiation from H II regions as a function of k₀ for each galaxy, assuming Δh = 1 kpc. Star symbols correspond to the k₀ values with the lowest .