Density distribution of the power of the highest peak in the GLS periodograms as a function of their timescale for 34739 variable sources analysed in Sect. 4.2.1, shown regardless of their FAL. The green dashed lines show the normalised frequency distribution of GLS timescales for sources affected by spurious variability introduced by the complex scanning law of Gaia and varying object scanning angles identified in Sect. A.2. This distribution is renormalised here for visualisation purposes. The red rugged lines highlight timescales in excess in our sample due to residual spurious variability, and masked from our sample.