| Code | Definition | Number of Accessions |
| 2 | very narrow to narrow 2,0 - 3,5 (mm) | 3 |
| 3 | narrow 3,6 - 5,0 (mm) | 4 |
| 4 | narrow to medium 5,1 - 6,5 (mm) | 7 |
| 5 | medium 6,6 - 8,0 (mm) | 4 |
| 6 | medium to wide 8,1 - 9,5 (mm) | 2 |
| 7 | wide 9,6 - 11,0 (mm) | 6 |
| 8 | wide to very wide 11,1 - 12,5 (mm) | 4 |
| 9 | very wide > 12,5 (mm) | 5 |