Selected NIR-to-FIR characteristic intensity ratios. Left: intensity ratios calculated as a function of a_setting for the benchmark model. a_min, defining the evolution of the small and large dust grain distributions, is varied from the MRN value (0.005 μm) to 3 μm. The shaded regions delimited by dotted lines represent the expected observed intensity ratios, taking into account the variations between JWST observations and previous photometric data points. The central panels are 2D representations of the same model results. Right: exploration of the effect of cavity radius on the 21 to 890 μm intensity ratio in the benchmark model, which includes the presence of an inner, partially filled, cavity. A better agreement is obtained for r_cav above several tens of astronomical units.