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1 Introduction
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2 The K20 survey and its main results
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3 Spectroscopic observations and data reduction
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4 Redshift determination and spectral features measurement
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5 Galaxy spectroscopic classifications
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6 Composite spectra
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7 Release of the spectroscopic catalogue
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8 Evolution of the spectral properties of the K20 spectroscopic sample
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9 Conclusions
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References
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