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Fig. 13

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HR diagram for NGC 6231 (black symbols) and the wider Sco OB1 association (blue symbols) with the non rotating isochrones of Schaller et al. (1992; solid lines) and the rotating isochrones of Meynet & Maeder (2005; dashed line) overplotted. Open and filled symbols represent main sequence and evolved stars, while diamonds indicate binarity. For HD 152248 we plot the position of both the individual components and also that of the integrated system. See Appendix B for details of contruction.

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