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Fig. 2.

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Laboratory average values of the complex refractive indices n and k (black and purple lines, respectively) of HAC-like particles at 300 K and with a hydrogen concentration of H/C ≃ 0.35 (Prof. W. Duley, priv. comm.; see text for more details). The errors of the complex refractive indices were measured to be ∼20% (see e.g., Duley 1984).

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