tokens: Data from ESO FEROS programme ID 078.C-0493(A) and FLAMES programme 171.D-0237(B) were taken from the ESO archive. This research has made use of the simbad (Wenger et al. 2000 ) Database, operated at CDS, Strasbourg, France and the ESO Archive. JVS thanks the ESO Director General Discretionary Fund and Queen's University Belfast Visiting Scientist Fund for financial support. We would like to thank two anonymous referees whose comments significantly improved the paper.
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