h

$E_{\infty }$

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

1/20

1.2124 e−003

—

1/40

3.0265e−004

2.0096

1/80

7.1816e−005

2.0963

1/160

2.0297e−005

2.1867