Fig. 4.
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Hertzsprung–Russell diagram showing all stars in the sample and with the colour showing the derived spectral masses. The diamonds mark all the stars with spectral types Ia, while the ‘v’ symbols mark the lower luminosity classes. The stellar evolution tracks are from the MIST data base without any rotation (Dotter 2016; Choi et al. 2016; Paxton et al. 2010, 2013, 2015).
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