Table 4: Effects of the free parameters of the model on the SED and spatial distribution of the 20.5 $\mu$ m emission in the CAMIRAS image.
Parameter Influence on SED Spatial distribution at 20.5 $\mu$ m

$\Sigma_{0}$ Influence on the total flux in the mid-IR No influence

and more strongly for $\lambda \ge$ 60 $\mu$ m

p No influence in the mid-IR Little influence

$H_{p}^{\rm in}/R_{\rm in}$ Modifies contrast mid-/near-IR No influence

(structure inner rim/shadow) (inner rim + shadow in the first pixel)

q Modifies the whole shape of the SED Large influence

$H_{p}^{\rm out}/R_{\rm out}$ Modifies flux in the mid- and far-IR Little influence

$R_{\rm out}$ Modifies far-IR emission Large influence

**Table 4:** Effects of the free parameters of the model on the SED and spatial distribution of the 20.5 $\mu$ m emission in the CAMIRAS image.
Parameter	Influence on SED	Spatial distribution at 20.5 $\mu$ m
$\Sigma_{0}$	Influence on the total flux in the mid-IR	No influence
	and more strongly for $\lambda \ge$ 60 $\mu$ m
p	No influence in the mid-IR	Little influence
$H_{p}^{\rm in}/R_{\rm in}$	Modifies contrast mid-/near-IR	No influence
	(structure inner rim/shadow)	(inner rim + shadow in the first pixel)
q	Modifies the whole shape of the SED	Large influence
$H_{p}^{\rm out}/R_{\rm out}$	Modifies flux in the mid- and far-IR	Little influence
$R_{\rm out}$	Modifies far-IR emission	Large influence

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