Table 3: Aliphatic hydrocarbons/silicates ratio.
Source $\tau ({3.4}~\mu$m) $\tau$(silicates) 3.4 ${\mu }$m/silicates
name      
NGC 1068 $0.1\pm0.015$ $0.9\pm0.1^{{a}}$ $0.11\pm0.05$
NGC 7172 $0.09\pm0.015$ >0.3b <0.35
IRAS 19254-7245 $0.7\pm0.1$ Saturated -
NGC 5506 $0.04\pm0.01$ $0.9\pm0.2^{{c}}$ $0.05\pm0.2$
    a Using the value derived by Tomono et al. (2001) in the central 1'' of NGC 1068; b based on the color excess E(B-V) as explained in Veilleux et al. (1997); c estimated using the Infrared Space Observatory Photometer PHT40 spectrum recorded on 13-Aug.-1996.

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