Fig. 2
IC 1613’s colour−magnitude diagram. Colours and symbols as in Fig. 1. OB-stars are dispersed in the colour−magnitude diagram, and do not concentrate on the galaxy’s blue-plume. In view of this diagram three targets are remarkably reddened, and would have been discarded with classical B − V colour cuts. The brightest stars of the blue-plume are early-B supergiants.
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