| size of the channel | number of pages * |
| 5 mm (AA) | soft cover 15-40 hard cover 20-4 |
| 10 mm (A) | 41-90 |
| 13 mm (B) | 91-120 |
| 16 mm (C) | 121-145 |
| 20 mm (D) | 146-185 |
| 24 mm (E) | 186-230 |
| 28 mm (F) | 231-265 |
| 32 mm (G) | 266-300 |
* tested on 80g/m2 paper
