Projected correlation function w_gg as a function of comoving transverse separation r_p. Top panel: for the SDSS LRG sample with redshifts smaller than 0.27 (black) and with redshifts larger than 0.27 (red). Bottom panel: for the MegaZ-LRG sample with photometric redshifts smaller than 0.529 (black) and with photometric redshifts larger than 0.529 (red). Note that the red points have been slightly offset horizontally for clarity, and that the error bars are strongly correlated. In addition we show the best-fit models as black and red curves, respectively. Only the data points outside the grey region have been used for the fits to avoid the regime of nonlinear bias.