Normalised GLS periodograms for frequencies between 0.001 d⁻¹ (1000 d) and 0.2 d⁻¹ (5 d) of the raw data (left panels) and the disentangled data (right panels) for the Lorenzi1980, ASAS-3, APASS, ASAS-SN, and KWS datasets. In all panels, a FAP level of 99.9% is indicated by horizontal dashed red lines, while the period of 417 days corresponding to the previously reported long cycle is marked with a vertical orange line.