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Mean angle and proportion of the number of lines in different clusters.
| Image | Cluster 1 | Cluster 2 | Cluster 3 | Cluster 4 | Cluster 5 | Head cluster | Tail cluster | Proportion of number (%) |
|---|---|---|---|---|---|---|---|---|
| Checkpoint 1 | 61.66° | 37.52° | 124.43° | 144.76° | 86.51° | 6.18° | 172.02° | 94.39 |
| Checkpoint 2 | 57.94° | 114.49° | 171.03° | 91.50° | — | 9.24° | 171.84° | 94.74 |
| Checkpoint 3 | 50.13° | 88.06° | — | — | — | 0.61° | 176.23° | 96.07 |
| Checkpoint 4 | 132.68° | 161.85° | 84.17° | 92.60° | 102.40° | 4.96° | 175° | 97.39 |
