First six rows: periodograms of the granulation RV_stell + RV_pla (left) and planet RV_pla alone (right), for the 8-day sampling (30 min over 1 night). Each row corresponds to a different planet period from 3 to 480 days. The planet has a mass of 1 M_Earth and an arbitrary phase. The false alarm probability at the 1% (dot-dashed lines) and 0.1% (dashed lines) levels are shown on the left plots. Last row: periodogram for the granulation RV_stell alone.