M-8311-12701 is an example of a galaxy with an LS-type abundance distribution. Panel a: 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 dex in the fractional radius R/R₂₅, and the bars show the scatter in the O/H about the median value in the bins. The line shows the adopted relation for the radial abundance distribution. The abundance at the radius R_b, OH is marked by the cross and at the radius R_b, NH by the triangle. Panel b: Same as panel a, but for nitrogen abundance. Panel c: Same as panel a, but for the N/O ratio. Panel d: N/O vs. O/H diagram. The yellow points denote H II regions in nearby galaxies (compilation in Pilyugin & Grebel 2016). The other designations are the same as in panel a.