| Code | Definition | Number of Accessions |
| 1 | very short < 8,0 cm - line >12,0 cm - population, hybrid | 3 |
| 2 | 8,0- 9,0 cm - line 12,0-14,0 cm - population, hybrid | 14 |
| 3 | short 9,1-10,0 cm - line 14,1-16,0 cm - population, hybrid | 52 |
| 4 | 10,1-11,0 cm - line 16,1-18,0 cm - population, hybrid | 122 |
| 5 | intermediate 11,1-12,0 cm - line 18,1-20,0 cm - population, hybrid | 182 |
| 6 | 12,1-14,0 cm - line 20,1-22,0 cm - population, hybrid | 253 |
| 7 | long 14,1-16,0 cm - line 22,1-24,0 cm - population, hybrid | 88 |
| 8 | 16,1-18,0 cm - line 24,1-26,0 cm - population, hybrid | 16 |
| 9 | very long >18,0 cm - line >26,0 cm - population, hybrid | 5 |