Left: EW of the Na I D vs. Mg I b absorption lines. Open black and solid blue points represents sources with and without ionized outflows respectively (i.e. V_max ≶ 650 km s^-1). The dashed line indicates the ratio at which the sodium is expected on the basis of observed magnesium EW (Heckman et al. 2000); the solid line indicates the starburst-driven outflow region proposed by Rupke et al. (2005a). The letters A and B indicate the sources for which the spectra are shown on the right. Right: SDSS spectra of J113240.24+525701.3 and MKN 848 (indicated with the letters A and B in the diagnostic diagram) around the Mg I b (left panels) and Na I D (right panels) absorption features. Orange curves show the best-fit pPXF results. Vertical lines represent the systemic of Mg I b triplet ([I] and [III] panels), and He I and Na I D doublet ([II] and [IV] panels). Panels [II] and [IV] show our fit results. Green, blue, and red curves represent the NC, OC, and the total best-fit model, respectively.