| Code | Definition | Number of Accessions |
| 1 | Abundant | 1787 |
| 2 | (1 = Abundant, 9 = Sparse) | 21 |
| 3 | (1 = Abundant, 9 = Sparse) | 58 |
| 4 | (1 = Abundant, 9 = Sparse) | 11 |
| 5 | Medium | 1478 |
| 6 | (1 = Abundant, 9 = Sparse) | 4 |
| 7 | (1 = Abundant, 9 = Sparse) | 49 |
| 8 | (1 = Abundant, 9 = Sparse) | 2 |
| 9 | Sparse | 379 |