Open Access
Table 1.
Statistics of the eight types of WL emission light curves.
| Type | Feature description | Number of pixels | Percentage |
|---|---|---|---|
| I | Rapid enhancement with a short duration | 203 | 35.37% |
| II | A slow growth phase followed by rapid growth with a long duration | 79 | 13.76% |
| III | Two consecutive peaks for the WL emission flux | 27 | 4.70% |
| IV | Associate with a continuous upward trend in the background | 56 | 9.76% |
| V | Show a continuous downward trend in the background | 123 | 21.43% |
| VI | Show a reversal of the background trend before and after the WL emission | 34 | 5.92% |
| VII | Associate with a step-like change of the background trend | 43 | 7.49% |
| VIII | Show a cluttered background | 9 | 1.57% |
| Total | 574 | 100% | |
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