Residuals of lensing concentrations with respect to the power-law fit. As in Fig. 7, the dashed line histogram indicates the residuals for objects with low LoS effects (low value of M^2D/M). The solid line histogram contains the additional constraints of halos with β and γ parameters close to the ones of an NFW profile (2.8 < β < 3.2 and 0.8 < γ < 1.2). Each histogram label reports the scatter σ of the residuals.