Fig. 2
Left: OGLE-III and IV lightcurve for AV 220 (colour scheme as in Fig. 1). Middle: comparison of the different period search methods, with tickmarks at the top indicating periods of 3846 d, 1299 d, and 1100 d. The presence of a signal is marked by a maximum for Fourier and AOV methods, but by a minimum for conditional entropy, Renson and Lafler & Kinman methods. Right: Fourier periodogram for the raw (top) and prewhitened (middle, for the best-fit Fourier period P = 1299 d) data, along with the spectral window (bottom).
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