Top: the distribution of targeted and serendipitous galaxies in impact parameter to the QSO sight line (ρ) and rest-frame g-band luminosity (﹩{L}_{\mathrm{gal}}﹩). The targeted galaxies tend to have lower luminosities and smaller impact parameters. Gray squares show the distribution of COS-Halos galaxies, and gray diamonds show the distribution of COS-Dwarfs galaxies. Bottom: same as the top panel, except the impact parameter has been normalized by the virial radius of the nearest galaxy. The targeted and serendipitous galaxies are probed by the QSO sight lines over a similar range of virial radii, but the targeted galaxies are probed primarily at ﹩\rho \lt {R}_{\mathrm{vir}}﹩.