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This article has an erratum: [https://doi.org/10.1051/0004-6361/201117624e]


Fig. 4

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A schematic Tauc plot for bulk hydrocarbon data (Mennella et al. 1995). From bottom to top the deposition annealing temperature increases from 20 to 800 °C. The dashed lines show the extrapolation of the linear portions to derive the Tauc gap Eg.

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