Table 3 Classification result of the fuzzy clustering method for the remaining nine detecting points
| Category code | Number of detecting points |
|---|---|
| First category | 1, 3 |
| Second category | 6, 8 |
| Third category | 2, 4, 5 |
| Fourth category | 7, 9 |
| Category code | Number of detecting points |
|---|---|
| First category | 1, 3 |
| Second category | 6, 8 |
| Third category | 2, 4, 5 |
| Fourth category | 7, 9 |