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Fig. 1

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Comparison of one- and two-term Fourier analysis for identifying the rotation period. Top: phased TESS LC for an example mCP star with a decidedly double-waved pattern at the rotational period (i.e. two maxima and two minima per rotation). Middle: standard single-term frequency analysis, showing that the strongest peak is at 2×frot. Bottom: two-term frequency analysis, where the strongest peak is at frot.

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