Sample number

1

2

3

4

5

6

Closeness degree

0.4

0.5

0.48

0.44

0.42

0.44

Sample number

7

8

9

10

11

12

Closeness degree

0.5

0.46

0.52

0.48

0.48

0.43

Sample number

13

14

15

16

17

18

Closeness degree

0.48

0.46

0.49

0.51

0.5

0.45