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Fig. 1.

image

All-sky view centred on the Milky Way Plane in an Aitoff projection from Mellinger (2009) with a Galactic coordinate grid. Giants observed by the Gaia-ESO survey for which C and N abundances are determined are colour-coded: clusters members (red) and field stars (yellow). We also represent nine open clusters (Collinder 261, Melotte 66, NGC 6253, NGC 3960, NGC 2324, NGC 2477, NGC 2506, IC4651, NGC 6134) for which 12C/13C is derived (cyan diamond, see Sect. 4.3).

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