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Fig. 7.

Hydrogen-rich sequences in the plane log(g) − Teff. Blue solid lines indicate 0, 20, 40, 60, 80, 90, 95 and 99% of crystallized mass. The symbols with error bars indicate the location of the known pulsating ultra-massive DA white dwarfs (Mukadam et al. 2004; Hermes et al. 2013; Curd et al. 2017; Nitta et al. 2016).
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