Fig. 2.
Oxygen abundance gradient for NGC 257. Circles represent the oxygen abundance in the individual spaxels. Vertical dashed lines represent 0.25 and 1.0 fraction of optical radius R25. The black solid line shows the best fit to all the data. Dashed red lines correspond to the best fit of the oxygen abundance gradient in the inner (R < 0.25R25) and outer (0.25R25 < R < R25) parts of the galaxy. The typical uncertainty of the oxygen abundance determination for the single spaxel is presented in the top right corner.
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