UV extinction curve resulting from the grain distribution with the best parameters from our self-consistent model of the atomic region (red line). The contributions from the two grain distribution components are also shown in dashed black line for pseudo-aggregates and in solid black line for nano-grains a-C. For comparison, the standard extinction curve from Savage & Mathis (1979) (SM79) is represented by black cross symbols. The figure is produced using DustEM (Compiègne et al. 2011).