$\tau$

$E_{\infty }$

${\log }_2\frac{E_{\infty }\left(h,\tau \right)}{E_{\infty }\left(h,\tau /2\right)}$

1/400

1.027403e−3

—

1/800

3.596508e−4

1.514334

1/1600

1.269148−4

1.502736

1/3200

4.468048e−5

1.506144