Cosmological constraints. Top: constraints on Ω_m, Ω_Λ when considering the aperture-corrected sample (blue), compared to the g-band fraction sample (red) and the entire SDSS sample (green). The best-fit value for the SDSS data set, assuming a flat ΛCDM model (plotted as a dashed black line) is shown as a black star. Differences in the contours are primarily due to different host galaxy selection. Bottom: 1D, marginalized contours for Ω_m are shown for the three samples, once a flat ΛCDM cosmology is assumed.