The best-fit correlation between L_X, T_a and E_γ,iso for all the 77 GRBs of D2010. The units of all physical quantity are the same as Fig. 2. The X-axis is a combined quantity of 0.81−0.91log T_a + 0.59log E_γ,iso. The filled points correspond to the observed data of 55 “golden” GRBs with error bars. The hollow diamonds correspond to 7 GRBs with too large error bars to be plotted in the figure, and the hollow circles correspond to other 15 discarded events. The solid line is the best fit for all the 77 data points.