h

$\tau$

$E_{\infty }\left(h,\tau \right)$

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

1/10

1/20

4.369783e−04

*

1/20

1/40

1.106462e−04

3.9493

1/40

1/80

2.771186e−05

3.9927

1/80

1/160

6.926296e−06

4.0010

1/160

1/320

1.732371e−06

3.9982

1/320

1/640

4.330753e−07

4.0002

1/640

1/1280

1.082610e−07

4.0003

1/1280

1/2560

2.706447e−08

4.0001