Weak-lensing mass biases for clusters at z = 0.22. The points are the same as in Fig. 6. The different line styles and coloured curves display the moving averages for different approaches when modelling the concentration. The solid black line refers to the reference case, where we varied both the mass and the concentration in our MCMC analysis. The solid green, dotted cyan, and dark red curves refer to the case in which we assumed a concentration-mass relation model, as in the figure label. On the other side, the orange and olive curves assume a constant value of c₂₀₀ = 3 and c₂₀₀ = 4, respectively. The dotted coloured lines display the linear regressions to the moving average and the corresponding uncertainty (not shown for the orange data for clarity). The top and left panels show the mean relative mass uncertainties as a function of the true cluster mass and the distributions of the weak-lensing mass biases, respectively.