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Article Contents
1 Introduction
2 Sample selection
3 Quantifying the difference between EW R23 and flux R23: determining the $\alpha $ parameter
4 Analysis of emission-line quantities
5 Modifying the EW R23-method
6 Discussions about the boundary of the upper branch of 12+log (O/H)
7 Summary and conclusion
References
List of figures
Copyright ESO 2007
Published by EDP Sciences