Ratio of the central mass of the halo mass distribution, M_{h,   cent}, and the best fit NFW mass (top) and the ratio of the mean halo mass and the best fit NFW mass (bottom) as a function of best fit NFW mass. Different lines correspond to σ_mh values of 0.10 (bottom line), 0.15, 0.20, 0.25, 0.30, 0.35 and 0.40 (top line). The lensing mass is converted to the mean halo mass using the corrections from the bottom panel.