| Code | Definition | Number of Accessions |
| 1 | very short | 5 |
| 2 | (1= very short, 9= very long) | 5 |
| 3 | (1= very short, 9= very long) | 5 |
| 4 | (1= very short, 9= very long) | 5 |
| 5 | (1= very short, 9= very long) | 2 |
| 6 | (1= very short, 9= very long) | 1 |
| 7 | (1= very short, 9= very long) | 1 |