The N2O3 diagnostic diagram for our central spectrum (cent), the SDSS spectrum (sdss), the total integrated our spectrum (int), and the individual fibre-spectra of signal-to-noise ratio  >5σ and Hα line intensity  >3 × 10^-16 erg s^-1 cm^-2 arcsec^-2 (blue dots). The solid and dashed lines separate the zones of starburst galaxies (below the lines) and AGNs (above the lines) as defined by Kewley et al. (2001) and Kauffmann et al. (2003), respectively.