| Code | Definition | Number of Accessions |
| 1 | very lax <10,0 (2-row) / < 30,0 (6-row) | 26 |
| 2 | 10,0-11,0 (2-row) / 30,0-33,0 (6-row) | 1 |
| 3 | lax 11,1-12,0 (2-row) / 33,1-36,0 (6-row) | 459 |
| 4 | 12,1-13,0 (2-row) / 36,1-39,0 (6-row) | 2 |
| 5 | medium 13,1-14,0 (2-row) / 39,1-42,0 (6-row) | 1819 |
| 7 | dense 15,1-16,0 (2-row) / 45,1-48,0 (6-row) | 304 |
| 9 | very dense >17,0 (2-row) / > 51,0 (6-row) | 58 |