Lomb-Scargle periodograms for the RV standard sample. The vertical dotted grey lines represent the periods of the harmonics of one year (from 365 to 365/6 days). The vertical magenta lines denote known planet signals for GJ 447 and proposed planet signals for GJ 229A. The horizontal grey lines represent the false alarm probability level of 1 (dashed line) and 10% (dash-dotted line).