Oxygen abundance in the MaNGA galaxy M-8274-12703. Panel a: Oxygen abundance map. The distribution across the image of the galaxy in sky coordinates (pixels). The oxygen abundance value is colour-coded. The circle shows the kinematic centre of the galaxy, the line indicates the position of the major kinematic axis of the galaxy, and the ellipse is the optical radius. Panel b: Radial oxygen abundance distribution. The grey points denote the abundances for the individual spaxels, the red circles are the median values of the O/H in bins of 0.05 in the fractional radius R/R₂₅, and the bars show the scatter in the O/H about the median value in the bins.