GLS periodogram of the RV data (top panel), the five Keplerian model (second panel), the GP model (third panel), and the residuals (fourth panel). The horizontal lines show the 10% (dashed line), 1% (dot-dashed line), and 0.1% (dotted line) FAP levels calculated following Zechmeister & Kürster (2009). The coloured dotted vertical lines show the position of the known transiting planets while the black dotted vertical lines show the position of the estimated rotation period of the star and its first harmonic.