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Fig. 9

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Colour–magnitude diagram of the final cluster sample. Stars with counterparts in the LHO catalogue are flagged with symbols according to their spectral type (box: WR-stars, circle: OB-stars, stars with ambiguous identification are additionally marked with an X-cross). The horizontal dashed and short-dashed lines mark the initial masses along the isochrone in units of M. The tilted dotted lines show the lines of reddening according to the extinction law by Nishiyama et al. (2009) and enframe the two regions in the CMD (shaded in grey in Figs. 911), within which the isochrone has multiple intersections with the line of reddening, and consequently no unique mass can be inferred for a given star.

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