Fig. 25
W(5797)/W(5780) is plotted against the total-to-selective visual extinction ratio RV for 23 stars. The low and high density sightlines are indicated by squares and circles, respectively. Values are from Wegner (2002) [W02]; Valencic et al. (2004) [V04], and Fitzpatrick & Massa (2007) [FM07].
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