| Value | Category | Cases | |
|---|---|---|---|
| 1 | Flat | 709 |
45%
|
| 2 | Roughly Conical | 316 |
20.1%
|
| 3 | Gable (triangular cross-section) | 486 |
30.8%
|
| 4 | None of the above | 65 |
4.1%
|
| Sysmiss | 3014 |