| Code | Definition | Number of Accessions |
| 1 | very short | 4 |
| 2 | (1= very short, 9= very long) | 22 |
| 3 | (1= very short, 9= very long) | 49 |
| 4 | (1= very short, 9= very long) | 131 |
| 5 | (1= very short, 9= very long) | 185 |
| 6 | (1= very short, 9= very long) | 159 |
| 7 | (1= very short, 9= very long) | 64 |
| 8 | (1= very short, 9= very long) | 17 |
| 9 | very long | 1 |