α

h

${\Vert v-V\Vert }_{\infty }$

Order ≈

$\Vert v-V\Vert$

Order ≈

0.3

0.6

0.9

1/20

1/30

1/40

1/50

1/20

1/30

1/40

1/50

1/20

1/30

1/40

1/50

6.5721e−05

1.3006e−05

4.1178e−06

1.6872e−06

1.6833e−04

3.3277e−05

1.0532e−05

4.3143e−06

2.4525e−04

4.8456e−05

1.5333e−05

6.2803e−06

—

3.9954

3.9978

3.9985

—

3.9980

3.9990

3.9996

—

3.9994

3.9997

4.0001

3.8685e−07

7.7155e−08

2.4494e−08

1.0048e−08

2.9861e−06

5.9065e−07

1.8697e−07

7.6599e−08

4.9352e−06

9.7526e−07

3.0862e−07

1.2641e−07

—

3.9954

3.9977

3.9988

—

3.9981

3.9990

3.9995

—

3.9994

3.9999

4.0000