Fig. 2
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β (Eq. (2)) values as a function of τ550 for objects with R550<0.85. Multiple dips of the same object are colour coded according their shortened 2MASS ID (see Table 1). Dashed blue line represents the value expected for ISM reddening under typical conditions, assuming the Cardelli extinction law (Cardelli et al. 1989) with RV=3.1.
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