Fig. 8

Spectral energy density in the 3.2–3.8 μm range calculated with THEMIS for a radiation field intensity G0 = 2.5 × 107 similar to that found in discs. The calculation was made with DustEM. From top right to bottom left, the band gap varies from 0.1 eV to 2.4 eV. In each subplot, the SED is plotted for several minimum sizes of grains.
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