Fig. 7.

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Period – period ratio diagram for the 30 galactic RRd stars (filled yellow circles). The blue and gray dots show two sets of pulsation models for the metallicity labels (corresponding to [M/H] = − 3.18 and −0.88 if Z⊙ = 0.0152). In the main plot, every second model is plotted, whereas in the inset, all models that fit the constrained period regime are shown.
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