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Fig. 3

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Line ratios from the models used for classifying the nebulae in the catalogue plotted in the traditional diagnostic diagrams from Baldwin et al. (1981). Black solid lines represent the relations from Kewley et al. (2001) which separates star-forming regions from other kinds of sources. The black dashed line represents the limit for pure star formation identified by Kauffmann et al. (2003).

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