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The selected EWs by SPA and RC.
| Pretreatment | Methods | No. | Selected EWs/nm |
|---|---|---|---|
| Raw | SPA | 6 | 716, 976, 684, 982, 409, 407 |
| RC | 8 | 409, 959, 968, 976, 982, 985, 988, 992 | |
| De-trending | SPA | 7 | 747, 724, 888, 995, 415, 897, 922 |
| RC | 11 | 403, 409, 897, 924, 934, 964, 968, 976, 981, 986, 989 |
