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Fig. 3


VUV measurements of ultra-thin films: a-C:H and soot optical depth spectra normalized to τ(~10 μm-1). a-C:H film, : MgF2 (Specord), : MgF2 (DISCO), : TEM membrane (DISCO). Soot film, : MgF2 (Specord), : MgF2 (DISCO), : TEM membrane (DISCO). Dashed lines show measurement dispersion.

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