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Comparison of the measured (red lines) refractive index n (a) and extinction coefficient k (b) and some previous results for CVD graphene on glass (blue lines) and quartz (green lines) substrates obtained without any assumptions in the ellipsometric model and carbon materials such as graphite (dashed lines) and SWCNT film (dotted lines). The data of Nelson, Li, Graphite, and SWCNT film are adopted from refs. [26,29,39,40], respectively.
