Comparison of the abundance of oxygen in a sample of RGB stars studied in the framework of the ESO Large Program First Stars, in CEMP-s and CEMP-no stars and in the low-Sr/Ba giants. The symbols are the same as in Fig. 3. The three low-Sr/Ba giants have an oxygen abundance similar to the abundance measured in the classical EMP stars, but several CEMP stars also have a normal oxygen abundance.
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