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Color ratio composition of the laser in each treatment.
| Laser treatment | Explanation |
|---|---|
| CK | No laser light irradiation (natural light) |
| R | Red laser (660 nm) |
| B | Blue laser (450 nm) |
| R1B1 | 50% red laser + 50% blue laser |
| R3B1 | 75% red laser + 25% blue laser |
| R3B2 | 60% red laser + 40% blue laser |
