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Main fluorophores and their positions.
| Name | Letter | Ex (nm)/Em (nm) |
|---|---|---|
| Humic-like | C | 340–360/420–480 |
| Fulvic-like | A | 240–260/380–460 |
| Tyrosine-like | B (B1, B2) | 265–285/290–310 |
| Tryptophan-like | T (T1, T2) | 265–285/290–340 |
| Microbial-like (Marine-like) | M | 310–330/390–410 |
| Humic-like | H | 370–390/480–500 |
