Fig. 5.
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Modulated RRc stars. Left column: K2 light curves. Middle column, in blue: Variation of A1, the Fourier-amplitude of the pulsation frequency. Right column, in blue: Variation of ϕ1, the Fourier phase. In red, middle and right: Variation of the amplitude and phase of the A1 curve when fitted with the shorter modulation frequency.
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