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Article Contents
1 Introduction
2 X-ray observations
3 X-ray analysis
4 Optical observations
5 Cross-correlations
6 X-ray/optical analysis
7 Sources with no candidate optical counterpart
8 Summary and conclusions
Online Material
Appendix A: Correction of the Classification Scheme
Appendix B: Measurement of the X-ray-to-optical flux ratios

List of tables
List of figures

Copyright ESO 2006
Published by EDP Sciences