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Table 2.
Summary of the formation and evolution of the LBs.
| Light bridge | Formation and evolution |
|---|---|
| LB1 | Strong and broad penumbral intrusion that breaks the umbra into two parts |
| LB2 | Weak and thin penumbral intrusion, which, after splitting the umbra, retreats until its disappearance |
| LB3 | Close approach of two umbra until the LB disappears from the northern part and finally from the south |
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