GLS periodogram analysis of the ASAS-3 V-band photometry. Top: GLS periodogram of the original photometry. The FAP levels of 5% (dashed), 1% (dash-dotted), and 0.1% (dotted) were computed via bootstrapping with 10 000 reshuffles and are plotted as horizontal lines. The periods of the four most prominent peaks are given in units of days. Middle: GLS periodogram of the residual photometry after removing the 2571 d fit. Bottom: LS periodogram of the window function.