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Multi-fibre emission-line spectrophotometry of 33 H II regions and 3 diffuseinterstellar medium positions are presented for the barred Magellanic galaxyNGC 1313. The H II regions show a fairly narrow range of thermal conditionscharacteristic of high excitation nebular gas. Electron temperature wasdirectly determined in four of the H II regions. The global O/H abundancedistribution appears very flat across the disk at 12 + log O/H = 8.4 +/- 0.1,with possibly the bar regions having abundances higher by 0.2 dex than theouter disc. NGC 1313 is the highest mass barred galaxy known not to have anyradial abundance gradient. The key role of the bar on the abundancedistribution in disc galaxies is revisited.Comment: To appear in MNRAS. (Latex, 9 pages, 5 postscript figures

The O/H distribution in the transition Magellanic galaxy NGC 1313