Left panel: number of planets per star in a given radius bin and an orbital period P < 50 d (a < 0.27 AU for a 1 M_⊙ star). The thick red line is the synthetic population. The blue line with error bars is from Howard et al. (2012) for the Kepler data of Feb. 2011 (Borucki et al. 2011). The black dotted line is the preliminary analysis of Howard et al. (2011) for the data of Sep. 2011 (Batalha et al. 2012). The observational data in the hatched region with R < 2   R_⊕ is incomplete. Right panel: normalized fraction of radii of the same synthetic planets as on the left, but with finer bins, and including only planets with R > 2   R_⊕.