| Geologic Model | Number of infi | Magnetic SI |
| Sphere | 0 | 3 |
| Pipe | 1 (z) | 2 |
| Horizontal cylinder | 1 (x − y) | 2 |
| Dyke | 2 (z and x − y) | 1 |
| Sill | 2 (x and y) | 1 |
| Contact | 3 (x, y, z) | 0 |