Correlation between the recovered cluster mass and total matter density parameter from our stacked weak lensing analysis. The different coloured data points refer to three redshift ranges considered (see legend, top left corner). The blue solid line displays the weighted average of the various estimated Ω_M for the different amplitude and redshift bins; the cyan shaded region encloses the 1σ uncertainty. The dashed red line gives the weighted average of the posterior distributions, as in Fig. 10.