Distribution of the galaxies in our sample in the BPT line-ratio diagram. The solid curve is the theoretical demarcation of Kewley et al. (2001) , that separates star-forming galaxies and composites from AGN. The dashed (Kauffmann et al. 2003a ) and dotted Stasinska et al. (2006) curves indicate the empirical division between composite SF-AGN and AGN-SF and the pure star-forming galaxies, respectively (see text for more details). The horizontal line at log  ([OIII]/Hβ) = 0.5 is the demarcation criteria between TYPE 2 (or Seyfert, Sy) and LINERs galaxies showed in Kewley et al. (2006).