Gas-phase oxygen abundance map. Each region on the maps corresponds to one H II region identified by HIIPHOT on the Hα map and has line ratios consistent with photoionization. We note that the abundance scale here is from the D13 model. The mean oxygen abundance derived from the T_e method is approximately 0.7 solar, as reported by Bresolin et al. (2005) who detected auroral lines in seven H II regions on the disk.