Applying the sphNFW model we show the mean bias (top row) and scatter (bottom row) as a function of source redshift for the cluster’s mass (left column) and concentration (right column), for our four mocks CL (black-dotted), CL+LoS (green-dashed), CL+σ_ϵ (blue-dot-dashed) and CL+LoS+σ_ϵ (red-solid). We estimate the bias of quantity ‘𝒬’ as the mean of the relative error distribution minus 1. We estimate the upper bound scatter (+) and lower bound scatter (−) using the 84th and 16th percentile of the relative error distribution, respectively.