Comparison with previous studies. From Jeltema et al. (2005) we show the mean P3/P0 values for z < 0.5 and z > 0.5 objects (black). Errors on these values are not provided. In addition, we plot the mean P3/P0 of Andersson et al. (2009) for three redshift bins (0.069 < z < 0.1, 0.1 < z < 0.3 and z > 0.3) in red. We provide our slope of the P3/P0-z plane calculated using an aperture of 0.5 Mpc for sample I (blue line) and the degraded sample I (green line) including the 1-σ errors as dashed area. The dashed line indicates the P3/P0 boundary at 10^-7.