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Article Contents
1 Introduction
2 Evidence for a low $\mathsf{E_{B-V}/N_{H}}$
3 Evidences for a low $\mathsf{A_V/N_{H}}$
4 Evidences for peculiar properties of dust grains
5 Evidences for $\mathsf{E_{B-V}/N_{H}}$ higher than Galactic?
6 Conclusions
References
Copyright ESO 2001
Published by EDP Sciences