| Code | Definition | Number of Accessions |
| 1 | very short | 16 |
| 2 | (1= very short, 9= very long) | 32 |
| 3 | (1= very short, 9= very long) | 180 |
| 4 | (1= very short, 9= very long) | 342 |
| 5 | (1= very short, 9= very long) | 357 |
| 6 | (1= very short, 9= very long) | 358 |
| 7 | (1= very short, 9= very long) | 356 |
| 8 | (1= very short, 9= very long) | 274 |
| 9 | very long | 94 |