Combined posteriors, in redshift, for the recovered total matter density parameter assuming different values of the truncation radius. The red-filled histogram shows the posterior of our reference model with r_t = 3. The gold, green, and blue histograms show the distributions of Ω_M assuming r_t = 4, 2, and 1, respectively. The grey histogram shows the result obtained from the stacked profiles estimated without accounting for the signal around random centres. The vertical red dashed line indicates the weighted average of the reference posterior distribution.