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Fig. 16

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The 18 μm silicate absorption features observed in four diffuse sightlines together with the modelled profile based on the 9.7 μm fit of the Galactic centre sightline (Min et al. 2007). The features are normalised at their peak. Noise levels vary with wavelength and are typically 0.03 in τ at the shortest wavelengths, and increase to 0.10 in τ for the longest wavelength. The anomalous feature seen towards G345.3650 − 00.4015 is plotted with a thicker line than the features in the other sightlines.

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