${\tau }_{\text{tutor}}^{*}$ (ms)	$\alpha$	$\beta$
10	$-0.75$	$-1.75$
20	$-0.5$	$-1.5$
40	$0.0$	$-1.0$
80	$1.0$	$0.0$
160	$3.0$	$2.0$
320	$7.0$	$6.0$
640	$15.0$	$14.0$
1280	$31.0$	$30.0$
2560	$63.0$	$62.0$
5120	$127.0$	$126.0$
10240	$255.0$	$254.0$
20480	$511.0$	$510.0$