$\alpha$

h

Error

Convergence order

1.1

1/20

1.3710e−04

1/40

3.3166e−05

2.0475

1/80

8.3605e−06

1.9880

1/160

2.0967e−06

1.9955

1.4

1/20

2.1069e−04

1/40

5.2013e−05

2.0182

1/80

1.3102e−05

1.9891

1/160

3.2717e−06

2.0017

1.7

1/20

2.6172e−04

1/40

6.4943e−05

2.0108

1/80

1.6238e−05

1.9998

1/160

4.0586e−06

2.0003