Effect of the maximum grain size on the diagrams of spectral shapes for the type-2 AGN PKS 2356-61. It shows the locus of the SEDs computed using the best-fit parameters and varying the maximum grain size P_size from 0.01 to 10 μm (i.e., ⟨P⟩ from 0.007 to 3.41 μm). The spectral shape diagrams are Silicate depth versus α_{5.5 − 7.5 μm} (left panels), α_{7.5 − 14 μm} versus α_{5.5 − 7.5 μm} slopes (middle panels), and α_{25 − 30 μm} versus α_{7.5 − 14 μm} (right panels). The empty-filled distribution is that from the entire SED library for GoMar23 model. Green small dots correspond to smaller grain sizes and redder and larger dots correspond to larger grain sizes (linked with lines). We mark as a blue dot the locus of the resulting values for the SEDs with P_{size = 0.25 μm} (⟨P⟩ = 0.097 μm) and as a yellow star the locus of the resulting values for the best fitted SED. The type-1 AGN are marked as black squares and type-2 AGN as gray diamonds.