| Model | Conventional formulation | Reduced parameter space reformulation |
|---|---|---|
| 1K | 2D (fB, K1) | 0D (no free parameters) |
| 2K | 3D (fB, K1, k2) | 1D (υ1) |
| 3K | 4D (fB, K1, k2 − k3) | 1D (υ1) |
| 4K | 5D (fB, K1, k2 − k4) | 2D (υ1, υ2) |
| 5K | 6D (fB, K1, k2 − k5) | 2D (υ1, υ2) |
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