Correlation functions obtained for DR7 LRG (top) and DR9 CMASS (bottom) data samples using the Landy-Szalay (left panels) and the iterative optimal estimator (right panels). The corresponding best fit is shown in solid red for Landy-Szalay and dashed blue for the iterative optimal estimator, and αMeasured is given in the legend, together with the χ2 /d.o.f. and its probability. The blue points are shifted by 1 Mpc/h to improve visibility. The covariance matrices used for these fits are based upon the LasDamas (DR7) or PTHalos (DR9) mock catalogues. (Coloured version of the figure available online.)
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