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Table 6:

Properties of the VISIR mid-IR spectra.

Object 		$\alpha $ $\log F_{\rm Si}/F_{\rm c}$ $\tau _{\rm silicate}$
NGC 1068 -1.52 -0.16 0.38
NGC 2110 -1.66 0.01 -0.03
ESO 428-G14 -2.62 -0.25 0.57
MCG-5-23-16 -2.36 -0.14 0.32
NGC 3227 -2.22 -0.06 0.13
NGC 3783 -1.84 -0.03 0.06
NGC 4507 -1.68 0.02 -0.05
NGC 4593 -1.51 0.06 -0.15
ESO 323-G77 -0.81 0.02 -0.05
MCG-3-34-64 -2.06 -0.09 0.20
MCG-6-30-15 -1.53 0.03 -0.08
IC 4329A -1.46 -0.01 0.02
NGC 5643 -3.05 -0.20 0.45
NGC 5995 -1.34 -0.05 0.13
MARK 509 -1.24 0.11 -0.25
IC 5063 -2.38 -0.12 0.28
NGC 7213 -2.21 0.10 -0.23
NGC 7582 -1.46 -0.45 1.03
NGC 7469 -2.01 0.01 -0.02
NGC 7674 -2.11 -0.08 0.19

Notes. For each object we list the 8.5-12.5 $\rm\mu m$ spectral index $\alpha $, the silicate feature strength  $F_{\rm Si}/F_{\rm c}$, and the corresponding optical depth in the silicate feature $\tau _{\rm silicate}$ (see Sects. 5.2 and 5.3 for details).


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