Activity model of the ESPRESSO RV measurements (upper panels) using a multi-sinusoidal function that uses up to six sinusoids with periods in the range [59,255] d, and RV residuals after subtracting this activity-only model (lower panels). The periods fitted are 79.1, 254.9, 68.2, 89.8, 59.5, and 244.9 d. The GLS periodograms of both the RVs and RV residuals are also displayed (left panels), with the detection of the 3.15 d signal(lower right panel).