Periodograms (zoom on the wide peaks) of the RV variations produced by a 100 (respectively 75, 50, 25, 5 from top to bottom) M_Earth planet at a phase of zero and period of 480.1 days, for Set 3, solid line (respectively dashed, dotted, dot-dashed, dot-dot-dot-dashed). The vertical line indicates the theoretical position of the peak. The arrows indicate the position of the planet peak for each planet mass.