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Article Contents
1 Introduction
2 Description of the sample
3 Observations and data reduction
4 CCD astrometry and photometry
5 The nature of the association of individual systems and some unresolved systems
6 Conclusions
Online Material
Appendix A: List of comments addressing specific systems of Tables 6 and 7, which for various reasons do not show a fixed binary configuration

List of tables
List of figures

Copyright ESO 2007
Published by EDP Sciences