Back to the Abstract

	1 Introduction
	2 Determination of the hydrogen column density from X-ray absorption
	3 Determination of the extinction from IR photometry
	4 The /AJ ratio in nearby star forming regions
	5 Constraints on the gas and dust properties from the /AJ ratio
	6 Conclusions and implications
	Appendix A: Modeling the interstellar grain population
	Appendix B: The N(CO)/N(H2) ratio and CO depletion onto grains
	References

	List of tables
	List of figures