$\Delta t$

$\alpha =1.2$

$\alpha =1.5$

$\alpha =1.8$

$\alpha =2.0$

Err₂

Rate

Err₂

Rate

Err₂

Rate

Err₂

Rate

S1

$\frac{1}{200}$

6.31E−05

-

6.84E−05

-

1.59E−05

-

1.52E−05

-

$\frac{1}{400}$

3.16E−05

0.99

3.43E−05

0.99

7.89E−06

1.01

7.54E−06

1.01

$\frac{1}{800}$

1.59E−05

1.00

1.72E−05

1.00

3.94E−06

1.00

3.76E−06

1.00

S2

$\frac{1}{200}$

1.84E−09

-

5.40E−09

-

3.02E−09

-

4.25E−09

-

$\frac{1}{400}$

4.64E−10

1.98

1.35E−09

2.01

7.54E−10

2.00

1.06E−09

2.00

$\frac{1}{800}$

1.17E−10

1.99

3.36E−10

2.00

1.88E−10

2.00

2.66E−10

2.00

S3

$\frac{1}{200}$

3.89E−10

-

4.12E−10

-

9.27E−11

-

8.90E−11

-

$\frac{1}{400}$

4.90E−11

2.99

5.19E−11

2.99

1.17E−11

2.99

1.12E−11

2.99

$\frac{1}{800}$

6.15E−12

2.99

6.52E−12

2.99

1.47E−12

3.00

1.41E−12

2.99