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Fig. 4a
GTC-OSIRIS spectra of OB-type stars in IC 1613. The spectra have been rebinned to 3 pixels and corrected by each star’s radial velocity, except for 71 708, for which we used IC 1613’s systemic velocity −234 km s-1 (Lu et al. 1993). The evolution of HeII4541/HeI4471 is clearly seen.
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