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Fig. 5

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Example of spectral synthesis in M 22: observations (black points) and synthetic spectra (red line) for the stars IV-97, IV-102, III-3, and III-14 around 1553.5 nm (left panel) and 1557.5 nm (right panel). Adopted abundances can be found in Tables 2 and 4. Some atomic and molecular lines are also indicated in the figure.

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