cluster_id	sec_channel
0	3
1	0
2	1
3	0
4	0
5	0
6	1
7	2
8	0
9	0
10	0
11	2
12	3
13	2
14	3
15	3
16	3
17	1
18	3
19	0
20	1
21	3
22	0
23	2
24	3
25	1
26	3
27	2
28	1
29	3
30	0