Figure 16
![2D distribution of the R23 and [O iii]/[N ii] metallicity indices for NGC 628. Both maps show a gradient of lower values in the inner regions to higher values to the outer part of the galaxy.](https://oup.silverchair-cdn.com/oup/backfile/Content_public/Journal/mnras/410/1/10.1111_j.1365-2966.2010.17444.x/1/mnras0410-0313-f16.jpeg?Expires=1750089484&Signature=I82zYuVFiAI1hdZOdl7RV6rjEbal08i87QugvqYZfVWZwahV31C3xBB6RKPt7gypjrwvHKwkxBfBD2knNTrkv6S1xP3w8R4P~xhNUKXB-GDNTwpBJ5Y48qs5ORvsPRPoKkDXeAJU3fhLI2lniQmP9PxvVATYDmO33bqHaR2VBIMnFVlexqBFcmtFiJu7Ty3Dw~Tdw8JV0-Z5Pb5hoI4ADaXrIynuDt2ci6udCmq2ITz53xRHpOGBt9JAl44Dm-wKA4bO~iS~yqHO417N4AF02XhPBuB5KmvMdGqLV5lpi25t0r8jdBYbjVTCYx7Px8zXCHRE9QwRiMA7Hmy8qI4aTw__&Key-Pair-Id=APKAIE5G5CRDK6RD3PGA)
2D distribution of the R23 and [O iii]/[N ii] metallicity indices for NGC 628. Both maps show a gradient of lower values in the inner regions to higher values to the outer part of the galaxy.
2D distribution of the R23 and [O iii]/[N ii] metallicity indices for NGC 628. Both maps show a gradient of lower values in the inner regions to higher values to the outer part of the galaxy.
