Shaft/hole | No of intervals | T1 nb/% | T2 | T3 | T4 | T4 | S T4 + T5 | |
IBO-1N | 429 | 95/22.14 | 77/17.95 | 154/35.90 | 35/8.16 | 68/15.85 | 24.01% | |
IBO-2 | 524 | 162/30.92 | 86/16.41 | 127/24.24 | 149/28.43 | - | 28.43% | |
IBO-3 | 325 | 80/24.61 | 165/50.77 | 48/14.77 | 32/9.85 | - | 9.85% | |
IBO-4 | 464 | 108/23.29 | 172/37.07 | 131/28.23 | 153/3.23 | 38/8.19 | 11.42% |