Table 3.

The structure of the network after removing nodes based on out-degree.

The threshold of out-degree	The number of nodes equal to or larger than the threshold	The number of nodes disappeared	Mean distance or average tree depth	The diameter or maximum tree depth
Infinity	0	0	1.43962	7
51	1	60	1.423477	7
25	3	157	1.379068	7
21	4	180	1.385996	7
18	5	201	1.391384	7
17	7	242	1.403056	7
16	8	259	1.409311	7
13	9	273	1.414201	7
11	11	309	1.418219	7
10	12	343	1.357714	7
8	18	406	1.365915	7
7	20	428	1.36965	7
6	25	467	1.382514	7
5	35	522	1.355243	7
4	59	635	1.172949	4
3	103	778	1.102389	3
2	174	926	1.089888	3
1	432	1239	0	0