| Value | Category | Cases | |
|---|---|---|---|
| 1 | Flat | 2727 |
68.3%
|
| 2 | Roughly Conical | 216 |
5.4%
|
| 3 | Gable (triangular cross-section) | 1015 |
25.4%
|
| 4 | None of the above | 34 |
0.9%
|
| Sysmiss | 2008 |