Fig. 4.
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Two subsets of the data (black) and the Fourier fits (red and blue) for the V1109 Cas observations, obtained by E. Denoux between 2013 and 2022. The blue fit only accounts for the mean period of the star and its harmonics, without modulation. The red fit takes into account the Blazhko modulation of the star, and fits the data better.
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