Fig. 4.
log(N/O) vs. [Fe/H] in our samples compared with the literature data of Israelian et al. (2004). Open clusters are shown with large filled circle (in green clusters with RGC > 7 kpc and in orange clusters with RGC ≤ 7 kpc), thin and thick disc stars are represented with smaller light blue and pink triangles, respectively. The literature sample of Israelian et al. (2004) is represented with cyan squares.
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