Fig. 3.
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ϕ31 Fourier phase parameter vs. pulsation period is shown for RR Lyrae stars in the thin disk (circles). Data includes stars with PM anomalies in the thin disk (squares) and the most metal-poor stars (stars). Blue crosses are highlighted the most metal-rich ([Fe/H] > −0.5 dex) RRc in the thin disk. The color bars represent metallicity data from Gaia DR3 (Clementini et al. 2023).
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