The sample of Kepler FGK dwarf stars around which a 1 R_⊕ planet receiving the same insolation as Earth could have been detected. The full set of 2136 stars is shown as gray circles, using the stellar effective temperatures and (log) surface gravities available in T. A. Berger et al. (2020). The randomly selected subset of 198 Sun-like control stars we observed is shown in color: control stars with detected companions are shown as orange squares, while those without detected companions are shown as blue circles. Side panels show corresponding histograms for the (top) stellar effective temperature and (right) surface gravity distributions.