Cross correlation analysis between redshift bins for the full sample. Top: auto-correlation in the redshift bin 0.4 < z < 0.6 (straight line) and cross-correlation between the bins 0.4 < z < 0.6 and 0.8 < z < 1.0 (dotted line) and between 0.4 < z < 0.6 and 1.0 < z < 1.2 (dashed line). Bottom: quantitative estimates of the contamination (percentage of galaxies scattered) from a pairwise analysis between redshift bins 0.4 < z < 0.6 and 0.8 < z < 1.0 (left) and between 0.4 < z < 0.6 and 1.0 < z < 1.2 (right). The contours show the 68.3 (blue), 95.5 (green) and 99.7 (red) confidence regions.