Continuum-to-total emission fraction at 7.7 μm (top) and at 11.3 μm (bottom) versus I_MIRI770/I_MIRI1130. While empty pentagons correspond to the data binned in the x-axis, the black-dashed lines are the best-fit functions to such binned data. Although with some scatter, at first order the distributions of the points are well described by the model α − β/(1 + e^{−γ(I_MIRI770/I_MIRI1130 − ρ)}). The top and right histograms in both panels correspond to the distribution of the values for the respective axes, and the red-dashed lines mark the median of such distributions.