Comparison of the performance of different methods as a function of N_obs, applied for constant input selection function (left column) and RAVE-based ISF (right column). Results are shown as a function of the number of observed stars N_obs. Top row: fractional uncertainty; middle row: relative standard deviation and relative median absolute deviation (see Eqs. (9) and (10)); bottom row: relative bias B (see Eq. (8)). Solid lines are for mean values, dotted lines are for median values. N_critical = 10 is used here.