Fig. 1

Upper left panel: empirical curves for dust extinction in the local Universe (Savage & Mathis 1979; Fitzpatrick 1989). Upper right panel: theoretical extinction curves predicted by type II SNe dust models proposed by Todini & Ferrara (2001) and Bianchi & Schneider (2007). Lower left panel: results of the type II SNe dust model by Hirasita et al. (2008). Lower right panel: predictions for extinction curves produced by PISNe dust (Hirasita et al. 2008). The main properties of the theoretical models shown in this figure are mentioned in Sect. 3.2.
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