GLS periodogram of the V1298 Tau RVs obtained with the SpotCCF (panel a) and the TERRA pipeline (panel b). The red dots highlight the maximum power and the dashed red line indicates the FAP at 1.0% (upper panels). The vertical dashed magenta line highlights the P_rot of the star, while the green dashed line indicates P_rot/2. The bottom panels show the RVs (left) and the residuals (right) phase folded with the dominant period. The colour gradient, as shown in Fig. 6, helps in identifying the modulation in the phase-fold residuals across different observing seasons.