Fig. 1.
HR diagram including the studied stars listed in Table 1 and evolutionary tracks for masses between 1.25 and 3.25 M⊙ at different initial chemical composition (black solid lines). Orange crosses are roAp stars while the blue ones are the other star of the sample. The dotted lines represent the iso-radius at 2.0, 3.0, and 4.0 R⊙. See the text for details about the models.
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