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Table 3
Number of stars for which the nitrogen abundance could be constrained and for which only upper limits could be derived, as a function of luminosity class.
| LC | III | II | I | Total |
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| Abundance constraint | 20 | 12 | 6 | 38 |
| Upper limit | 20 | 14 | 0 | 34 |
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| Total | 40 | 26 | 6 | 72 |
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