We begin by curating a list of sources which have RV measurements available , looking in particular for sources which have had no previous planet detections . Although numerous surveys have been published over the years , we limit ourselves to just the largest surveys in order to provide a degree of catalog homogeneity . Specifically , we seek one large survey in each celestial hemisphere to provide the necessary data . To this end , we identify the Lick - Carnegie Exoplanet Survey ( LCES ) using the HIRES instrument on Keck - I , and the High Accuracy Radial Velocity Planet Searcher ( HARPS ) mounted on the 3.6 m ESO telescope at La Silla as most suitable .