| Code | Definition | Number of Accessions |
| 1 | very small <18 - line <21 - population, hybrid | 8 |
| 2 | 18-21 - line 21-24 - population, hybrid | 35 |
| 3 | small 22-24 - line 25-27 - population, hybrid | 57 |
| 4 | 25-27 - line 28-30 - population, hybrid | 24 |
| 5 | intermediate 28-30 - line 31-35 - population, hybrid | 7 |
| 6 | 31-33 - line 36-40 - population, hybrid | 1 |