O/H, N/H and log(N/O) abundances plotted against distance from supernebula. Plotted values correspond to those listed in Table 5; blue asterisks: Walsh & Roy (1989), orange triangles: Kobulnicky et al. (1997), black circles: López-Sánchez et al. (2007), green squares: Monreal-Ibero et al. (2012), green plusses: Monreal-Ibero et al. (2012) individual spaxels, red triangles: this work. Physical distances have been calculated assuming a distance of 3.8 Mpc (Sakai et al. 2004).
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