| Value | Category | Cases | |
|---|---|---|---|
| 1 | Flat | 707 | 
                                    
                                    45.1%
                                 | 
| 2 | Roughly Conical | 310 | 
                                    
                                    19.8%
                                 | 
| 3 | Gable (triangular cross-section) | 486 | 
                                    
                                    31%
                                 | 
| 4 | None of the above | 65 | 
                                    
                                    4.1%
                                 | 
| Sysmiss | 2985 |