Percentage difference between the masses for PMS cluster members in NGC 2264, calculated by our procedure (T-values; see text) and those by D07, F06, and R02 (P-values), from upper to lower panels, respectively. The quantity 100 × (M_T − M_P)/M_P is plotted versus M_P, in the three published cases. The panels to the left show the masses calculated with respect to S00 isochrones. The panels to the right show masses calculated with respect to Y01 isochrones. Red circles and error bars show averages and rms deviations in the corresponding mass bins. The figure is to be compared to Figs. 4 and 5 in H04.