| Code | Definition | Number of Accessions |
| 1 | very thin < 6,50 (cm) | 29 |
| 2 | very thin to thin 6,51 – 7,0 (cm) | 7 |
| 3 | thin 7,01 – 7,5 (cm) | 4 |
| 4 | thin to medium 7,51 – 8,0 (cm) | 1 |
| 5 | medium 8,01 – 8,5 (cm) | 2 |
| 6 | medium to thick 8,51 – 9,0 (cm) | 4 |
| 7 | thick 9,01 – 9,5 (cm) | 2 |
| 8 | thick to very thick 9,51 – 10,0 (cm) | 2 |
| 9 | very thick > 10,01 (cm) | 3 |