| Model | σ1 (S/m) | σ2 (S/m) | σ3 (S/m) |
| M1 | 0.01 | 0.01 | 0.01 |
| M2 | 0.01 | 0.1 | 0.5 |
| M3 | 0.01 | 0.1 | 0.0005 |
| M4 | 0.01 | 0.001 | 0.5 |
| M5 | 0.01 | 0.001 | 0.0005 |