HE sparsities s_Δ1, Δ2^HE from the X (blue) and SZ (red) catalogues with respect to their GADGET-X counterparts at z = 0 in the case of s_200, 500 (left panel), s_500, 2500(central panel), and s_200, 2500 (right panel). The coloured dashed line correspond to the average linear fit to the 25 equally spaced binned data points (squares) in bins of true sparsities containing at least two clusters. The shaded areas indicates that 1 and 2σ credible regions. The black solid line corresponds to the unbiased case.