Impact of adopting different T_B, cri. Panel a: case of T_B,cri = 10^32.5 K. Total 181 bursts with T_B ≥ T_B, cri indicate . Panel b: case of T_B,cri = 10^33.5 K. Total 16 bursts with T_B ≥ T_B, cri indicate . Panel c: calculated correlation coefficient versus T_B, cri (red solid line). Black dashed line represents the critical r for null hypothesis. Panel d: rms of fitting residuals versus T_B, cri.