Time (second)

1

2

4

8

10

20

40

80

The measured σv

2.87E−11

1.95E−11

1.43E−11

1.01E−11

8.12E−12

7.17E−12

5.73E−12

4.99E−12

The needed σv

2.65E−9

1.32E−9

6.63E−10

3.31E−10

2.65E−10

1.32E−10

6.63E−11

3.31E−11