BPT diagram of the different galactic regions from the full sample with the K03 (solid) and K01 (dashed) demarcation lines. The central, disk, outer disk, and halo regions correspond to the 0.0–1.0, 1.0−1.5, 2.0–2.5, 3.0–3.5 b_e bins, respectively. The error bars correspond to the errors from the spectral fitting, propagated appropriately. Emission line ratios measured from SDSS DR7 fiber spectra for the main galaxy sample are plotted as gray dots.