log([OIII]5007/Hβ) vs. log([NII]6584A/Hα) for MISTRAL region #1 spectrum. From Kauffmann et al. (2003) and Kewley et al. (2013), the areas under the red and blue curves are for normal galaxies, while areas above these curves are for active objects. The green line shows the delimitation between Seyfert and LINERS galaxies (Kehrig et al. 2012). The vertical dark magenta arrow is to indicate that NED02 Region 1 has detectable Hα, N[II]6584 and O[III]5007 emissions but no detectable Hβ flux. The bottom of this line shows the minimal value from the lower detection limit of Hβ.