GLS periodogram of the V1298 Tau RVs obtained with the SpotCCF (panel a) and the TERRA (panel b) pipeline and their residuals after recursive prewhitening. In each panel, the vertical and dashed lines indicate the stellar rotation frequency (in magenta) and its harmonics (in green and black), and the horizontal red dashed line highlights the FAP at 1.0%. Each panel reports the RMS of the dataset.