Table 2 Summary of the statistical information of electrostatic solitary waves (ESWs)
| Â | Group 1 | Group 2 |
|---|---|---|
Total | 12,111 | 123,291 |
Type | Â | Â |
 Type-A | 5,968 (49.3%) | 61,871 (50.2%) |
 Type-B | 6,143 (50.7%) | 61,420 (49.8%) |
Solitariness | Â | Â |
 Coupled | 1,200 (9.9%) | 14,063 (11.4%) |
 Solitary | 10,911 (90.1%) | 109,228 (88.6%) |
If offset | Â | Â |
 Offset | 7,683 (63.4%) | 80,033 (64.9%) |
 Not offset | 4,428 (36.6%) | 43,258 (35.1%) |
Symmetry | Â | Â |
 Asymmetrical | 3,736 (30.8%) | 37,268 (30.2%) |
 Symmetrical | 8,375 (69.2%) | 86,023 (69.8%) |