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


Fig. 1

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Some available (hydrogenated) amorphous carbon optical data presented as the absorption coefficient, α. The data are colour-coded by the band gap Eg (small gap – upper, grey lines; large gap – lower left, yellow and green lines). See the text for details.

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