Observed and modeled extinction curve of single-cloud sight-lines. The extinction curve by Fitzpatrick (2004), Valencic et al. (2004) and Gordon et al. (2009) is shown as dashed line, UBV JHK photometry as filled circles, IUE/FUSE spectra are represented by the grey shaded area, and uncertainties are 1σ. The model is shown (brown solid lines), as well as the contribution of the different dust populations to the extinction (solid lines of various colours as labelled in the panels).
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