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1 Introduction
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2 The chemical abundances
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3 Characteristic oxygen abundance in spirals as a function
of
 ,
 ,
and Hubble type
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4 Comparison between O/H-
relationship for spiral and irregular galaxies
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5 The effective oxygen yields
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6 Comparison with previous studies
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7 Conclusions
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References
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Online Material
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Appendix A: Distances and luminosities
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