Fig. 1
Model dust populations, as seen in cross-section. In the upper part the a-C:H/a-C grains are shown, where black represents aromatic-rich material and white aliphatic-rich material. In the lower part amorphous silicate grains (green) are shown with a 5 nm thick coagulated/accreted a-C mantle. The particle radii are indicated on a logarithmic scale.
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