The 68% joint constraints in the (Ωm,ΩΛ) plane for an open ΛCDM cosmology combining CMB (WMAP 7 years Komatsu et al. 2011) and either DR7 (dashed lines) or DR9 (solid lines) SDSS BAO data, with either the Landy-Szalay estimator (blue thin lines) or the iterative optimal estimator (red thick lines). (Coloured version of the figure available online.)
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