Fig. 3.
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Location of the sample of GW Vir variable stars considered in this work in the Teff − log g plane depicted with black circles. Thin solid curves show the CO-core PG 1159 evolutionary tracks from Miller Bertolami & Althaus (2006) for different stellar masses. The locations of the GW Vir stars PG 1159−035 (DOV type) and NGC 6904 (PNNV type) are marked with red symbols.
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