Fig. 28
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Amplitude ratio of Fourier first-overtone amplitude and the amplitude of the additional signal for RRd candidates (see text for details). The period ratio of the two frequencies is plotted with different colors as indicated in the legend. The RRd candidates are plotted with squares. We also included RRd and aRRd stars from the Galactic bulge, which are plotted with circles and crosses, respectively (Soszyński et al. 2019). Right panel: Distribution of the amplitude ratio.
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