The Fourier amplitude spectrum of σ Gem using V-band photometry over ≈13 years. Top: power spectrum showing the strongest peak (Prot), with the orbital period (Porb) aside, and their overtones. Middle: amplitude spectrum around the orbital period with marking the equatorial and polar rotation periods (Peq, Ppole) from the differential rotation law in Sect. 2.4. Bottom: window function of the signal.
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