| Code | Definition | Number of Accessions |
| 1 | very small <12 - two-rowed <28 - six-rowed | 8 |
| 2 | 12-13 - two-rowed 28-32 - six-rowed | 9 |
| 3 | small 14-16 - two-rowed 33-36 - six-rowed | 42 |
| 4 | 17-19 - two-rowed 37-42 - six-rowed | 193 |
| 5 | medium 20-21 - two-rowed 43-46 - six-rowed | 190 |
| 6 | 22-24 - two-rowed 47-52 - six-rowed | 228 |
| 7 | large 25-27 - two-rowed 53-58 - six-rowed | 86 |
| 8 | 28-30 - two-rowed 59-60 - six-rowed | 12 |
| 9 | very large >30 - two-rowed >60 - six-rowed | 5 |