Diameter (cm)

Distance from surface (mm)

0

2

5

10

15

20

1.5

20.0

12.7

7.0

3.3

1.8

1.1

2.0

20.0

13.5

8.1

4.1

2.4

1.5

2.5

20.0

14.2

9.1

4.9

2.9

1.9

3.0

20.0

14.8

10.0

5.7

3.5

2.3

3.5

20.0

14.0

8.9

4.8

2.9

1.8

4.0

20.0

14.7

9.9

5.6

3.5

2.3

4.5

20.0

15.3

10.7

6.4

4.1

2.7

5.0

20.0

15.6

11.2

6.8

4.5

3.1