Fig. 1
BPT diagram of the selected objects. The blue points are the whole sample of 67 000 starburst galaxies. The red points are the resulting spectroscopic sample of ~4200 galaxies with the criteria given in Table 1. HII galaxies lie below and to the left of the Kauffmann et al. (2003) classification (solid red line) that distinguishes AGNs from star-forming galaxies.
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