Fig. 2
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Extinction curves normalized to their value at the effective wavelength of the W1 passband. The different lines correspond to various dust models and R(V) values, as indicated in the legend. WD01 refers to the models of Weingartner & Draine (2001), and D03 to those of Draine (2003). The curves illustrate how both the choice of dust model and R(V) parameter affect the wavelength dependence of extinction.
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