| Code | Definition | Number of Accessions |
| 1 | very small <18 - line <21 - population, hybrid | 109 |
| 2 | 18-21 - line 21-24 - population, hybrid | 179 |
| 3 | small 22-24 - line 25-27 - population, hybrid | 261 |
| 4 | 25-27 - line 28-30 - population, hybrid | 101 |
| 5 | intermediate 28-30 - line 31-35 - population, hybrid | 41 |
| 6 | 31-33 - line 36-40 - population, hybrid | 15 |
| 7 | large 34-36 - line 41-45 - population, hybrid | 23 |
| 8 | 37-39 - line 46-50 - population, hybrid | 1 |
| 9 | very large >39 - line >50 - population, hybrid | 2 |