Comparison between the marginalised posterior distributions of the best fit HOD parameters on the S2 sample and the diagonal error case. The filled 2D contours show the 1-σ and 2-σ confidence levels of the posteriors after convolution with the uniform priors. The model is given by Eq. 8. The corresponding 1D parameter constraints are reported in Table B.1. The blue (red) shaded area denotes the standard (diagonal error) case.